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TCG Istanbul (F-515), the lead ship of the Istanbul-class frigates, at the Bosporus strait, October 29, 2023.

The MILGEM project (Turkish: Milli Gemi Projesi; English: National Ship Project) is a national warship program of the Republic of Turkey. Managed by the Turkish Navy, the project aims at developing multipurpose corvettes, frigates and destroyers that can be deployed in a range of missions, including reconnaissance, surveillance, early warning, anti-submarine warfare, surface-to-surface and surface-to-air warfare, and amphibious operations.

As of 2023, the MILGEM project covers four Ada class anti-submarine warfare corvettes, one ELINT corvette, eight[1] Istanbul-class multipurpose frigates, 10 Hisar class OPVs as well as eight TF2000-class anti-air warfare destroyers destined for the Turkish Navy; four Babur-class corvettes for the Pakistan Navy; and two Ada class corvettes for the Ukrainian Navy.

The name of the project is derived from the phrase "National Ship" in Turkish – Milli Gemi.

History

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TCG Heybeliada (F-511), the lead ship of the Ada-class corvettes, in the Mediterranean Sea, September 2, 2014.

In mid 1990s the Turkish Navy was researching national resources to design, develop and construct a completely indigenous corvette. In 2004, Istanbul Naval Shipyard Command established MILGEM Project Office to execute and coordinate the design, engineering and construction projects.

By developing the MILGEM project, Turkey aimed to build a warship using local resources to the maximum extent possible, improve national military shipbuilding capacity and skills. The objectives for the Ada class were set to enhance the littoral warfare capabilities and to meet the operational requirements of the Turkish Navy.[2] MILGEM project office focused on building a modern littoral combat ship with authentic anti-submarine warfare and high-seas patrol capability, extensively employing low-observable superstructure and intelligence sensors. In 2005, Istanbul Naval Shipyard Command commenced the construction works of the first vessel of MILGEM project, TCG Heybeliada.

In 2014, Turkish defense technology and engineering company STM was selected as a subprime contractor for the construction of remaining Ada-class vessels. More than 50 local suppliers, including Turkish defense companies like ASELSAN and HAVELSAN played significant role in developing local subcomponents for command-and-control and electronic battle management system[3]

Characteristics

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Mock-up of Ada-class corvette

The ships are propelled by a RENK CODAG Cross Connect propulsion plant. It consists of a gas turbine rated at 23,000 kilowatts (31,000 hp) and two diesel engines rated at 4,320 kW (5,790 hp). Each diesel engine drives one controllable pitch propeller via a two speed main reduction gear. The cross connect gear splits the power from the gas turbine via both main reduction gears to the two shafts. The ship can be operated in diesel mode, in single gas turbine mode or in CODAG mode where diesel and gas turbine are providing a combined power of 27,640 kW (37,070 hp).

GENESIS (Gemi Entegre Savaş İdare Sistemi, i.e. Ship Integrated Combat Management System), a network-centric combat management system developed by HAVELSAN and originally used in the upgraded G-class frigates of the Turkish Navy, was contracted for the first two Ada-class corvettes on May 23, 2007.[4][5] The MILGEM ships have a national hull mounted sonar developed by the Scientific and Technological Research Council of Turkey.[6] Sonar dome has been developed by STM's subcontractor ONUK-BG Defence Systems, extensively employing nano-enhanced fiber reinforced polymer.[7] The Ada class features an electronic chart precise integrated navigation system (ECPINS) supplied by OSI Geospatial.[8] Integrated Platform Management System (IPMS), delivered by STM's subcontractor Yaltes JV, monitors and controls machinery, auxiliary systems, electrical power generation and distribution. The main systems integrated in IPMS include a power management system, fire detection system, fire fighting and damage control system, CCTV system and stability control system.[9]

Ships

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Hisar-class offshore patrol vessel

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Main article: Hisar-class offshore patrol vessel

Under the Offshore Patrol Vessel Project, initiated to meet the needs of the Turkish Naval Forces, the construction of ten offshore patrol vessels (OPVs) is planned. The first ship is scheduled to be launched in 2023. Developed as a variant of the MİLGEM-class corvettes, the Hisar class patrol ships has been redesigned with a different main propulsion system and a different structural and general layout concept, allowing it to be built in a shorter time and at a lower cost.

The primary missions of the OPVs to be built are intelligence, surveillance, and reconnaissance (ISR), search and rescue (SAR), counterterrorism, maritime interdiction operations (MIO), and maritime special operations. Other missions include naval air operations, electronic and acoustic warfare, land bombardment, defense against asymmetric threats, maritime traffic protection, and support and training for amphibious operations.

The Hisar-class patrol ships is being built using the "fitted for but not with" concept, which allows for the integration of newly developed indigenous weapon and sensor systems. The OPV, which can accommodate a total of 104 people, will have a range of 4,500 nautical miles (8,300 km; 5,200 mi) with its CODELOD (COmbined Diesel-eLectric Or Diesel) main propulsion system.

Ada-class corvette

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Main article: Ada-class corvette

The Ada class is a class of anti-submarine corvettes developed primarily for the Turkish Navy during the first stage of the MILGEM project. The Turkish Navy has commissioned all four Ada-class corvettes. The design objective of the Ada class was to build a modern littoral combat ship, with national anti-submarine warfare (ASW) and high-seas patrol capabilities, while extensively using the principles of low observable technology in its design.[10]

Istanbul-class frigate

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Main article: Istanbul-class frigate

The Istanbul-class Frigate Program was launched to construct eight[1] frigates to replace aging Yavuz-class frigates in the mid-2020s. Developed under the MILGEM indigenous warship program, the Istanbul class is an enlarged variant of the Ada-class anti-submarine corvette. The Istanbul-class frigates will have around 50% increased fuel capacity and operational/sailing range capability compared to Ada-class corvettes.

The Istanbul-class frigates have the configuration to conduct detection, determination of position, classification, identification, and destruction of the target and NGFS. The frigates are designed to conduct maritime surveillance and patrol operations, inspection, and surveillance of exclusive economic zone besides preventing potential threats.

TF-2000-class destroyer

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Main article: TF2000-class destroyer

The planned eight multi-mission TF2000-class destroyers are able to conduct anti-aircraft warfare (AAW) with SİPER and Sapan surface-to-air missiles; tactical land strikes with Gezgin cruise missiles; ASW with towed array sonar, anti-submarine rockets, and ASW helicopters; and anti-surface warfare (ASuW) with Atmaca missiles.[11]

Export

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According to a CNN Türk news report on September 27, 2008, the navies of Canada, Pakistan, Bangladesh, Ukraine and a number of South American countries have expressed interest in acquiring MILGEM project warships.[12][13] According to Bloomberg, Turkey is offering a $6 billion defense deal with Saudi Arabia which includes MILGEMs.[14]

Pakistan

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Main article: Babur-class corvette

The Babur-class corvette, also known as the PN MILGEM class, is a class of four heavy corvettes under construction for the Pakistan Navy. This class is a subclass of the Turkish MILGEM project. The corvette class is heavier and larger than the Turkish Ada-class corvette and are also equipped with a vertical launch system.

On 5 July 2018, Pakistani military's ISPR announced that a Turkish firm has won the tender to build four MILGEM corvettes for the Pakistan Navy. Turkish defence minister, Nurettin Canikli, described the deal as “the largest defense export of Turkey in one agreement.”[15]

By September 2018, some details have emerged that corvettes for Pakistan Navy will have CODAD propulsion system instead of CODAG, thus increasing the sea endurance from 10 to 15 days. Further, the first vessel is planned to be constructed in 54 months and the remaining vessels will be constructed in 60, 66 and 72 months, respectively.[16]

The Babur-class corvettes will be one of the most technologically advanced surface platforms of the Pakistan Navy fleet. Keel Laying ceremony of third PN MILGEM-class warship was held. The warship will complete in 2024.[17][18]

Coinciding with the commissioning ceremony of TCG Kınalıada attended by Turkish president Recep Tayyip Erdoğan, steel cutting ceremony for the first MILGEM ship for the Pakistan Navy was also held there on 29 September 2019.[19] The first Pakistani vessel named PNS Babur was launched on 15 August 2021.[20]

Romania

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In 2025, Romanian Navy made a deal to acquire HISAR-class corvette TCG Akhisar for €223 million.[21]

Ukraine

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In December 2020, the Ukrainian Navy signed a deal with Turkey's Presidency of Defense Industries for the production of Ada-class corvettes in the Okean shipyard at Mykolaiv, Ukraine.[22] In August 2022, the name of the first ship was announced as Hetman Ivan Mazepa after Hetman Ivan Mazepa.[23]

See also

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References

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Revisions and contributorsEdit on WikipediaRead on Wikipedia

MILGEM project

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The MILGEM project, an for Milli Gemi (National Ship), is a Turkish national initiative managed by the to indigenously design, develop, and construct corvettes and frigates, focusing on multipurpose surface combatants equipped for anti-submarine and to strengthen littoral operations. Launched by the Defense Industry Executive Committee on 15 February 2000, with detailed design work commencing in 2004 at the Istanbul Naval Shipyard, the program prioritizes domestic integration of advanced systems like combat management software and propulsion for reduced foreign dependency. The project's initial phase produced four Ada-class corvettes, starting with TCG Heybeliada (F-511), commissioned on 27 September 2011 as Turkey's first nationally designed warship featuring significant local content, including , , and systems. Subsequent developments advanced to the Istanbul-class (İ-class) frigates under phase two, with TCG İstanbul (F-515)—the lead ship and Turkey's inaugural indigenous frigate—achieving an 80% localization rate through incorporation of national weapons like the ATMACA missile and MİDLAS vertical launch system, and entering service on 19 January 2024. These vessels emphasize stealth design, CODAG propulsion for speeds up to 30 knots, and multi-role capabilities in air, surface, and subsurface domains. Key achievements include surpassing initial indigenous production targets—from around 70% in early Ada-class ships to over 80% in later frigates—fostering domestic technological expertise and enabling exports, such as four corvettes to Pakistan under joint production agreements that exemplify Turkey's growing defense export prowess. The program continues to evolve, with ongoing construction of additional İ-class units and plans for up to eight frigates, underscoring Turkey's strategic push toward naval self-sufficiency amid regional security demands.

Origins and Development

Inception and Initial Objectives

The MILGEM project, acronym for Milli Gemi (National Ship), originated from Turkey's strategic need to bolster domestic naval shipbuilding capacity amid evolving regional security demands. Formal inception occurred in early 2004, when the Turkish Naval Forces Command established the MILGEM Project Office at Istanbul Naval Shipyard to oversee design, engineering, and construction efforts. Work on initial project plans began specifically on March 12, 2004, marking the shift from conceptual studies—rooted in earlier 1990s evaluations of foreign designs like the German MEKO A-100—to a fully indigenous program focused on corvette-class vessels. Initial objectives centered on developing multipurpose hull forms for anti-submarine warfare corvettes, emphasizing maximum local content to minimize foreign dependency and cultivate national expertise in warship production. The program targeted the construction of up to 12 Ada-class corvettes to modernize the Turkish Navy's surface fleet, replacing obsolete ships with platforms capable of surface combat, submarine hunting, and maritime patrol. This approach aimed to integrate Turkish industry partners in subsystems like propulsion, sensors, and armaments, thereby achieving long-term self-sufficiency in naval architecture and reducing procurement costs through economies of scale. By prioritizing stealth features, advanced automation, and modular design from the outset, MILGEM sought to produce vessels competitive with international standards while addressing Turkey's specific operational requirements in the Aegean and Black Seas. The project's foundational phase involved competitive tendering among Turkish firms for lead ship design, culminating in the keel laying of the first vessel, TCG Heybeliada (F-511), on July 26, 2005. These efforts reflected a broader defense policy of indigenization, driven by geopolitical tensions and the limitations of off-the-shelf imports.

Phased Expansion and Key Milestones

The MILGEM project initiated in 2000 with the primary objective of developing indigenous corvettes to modernize the Turkish Navy's surface fleet, marking the first phase focused on the Ada-class anti-submarine warfare corvettes. On 15 February 2000, the Defense Industry Executive Committee approved the project's realization, leading to the establishment of the MILGEM Project Office at Istanbul Naval Shipyard in 2004 to oversee design, engineering, and construction coordination. Construction of the lead ship, TCG Heybeliada (F-511), commenced with keel laying on 22 January 2007, followed by its launch on 26 September 2011 and commissioning in 2013, validating the domestic design and production capabilities. Subsequent Ada-class vessels reinforced this phase: TCG Büyüka (F-512) was commissioned in 2016, TCG Burgazada (F-513) in 2018, and TCG Kınıklıada (F-514) on 30 September 2019, completing the initial four-ship procurement for the Turkish Navy. This success prompted phased expansion beyond corvettes, incorporating larger multipurpose frigates under the Istanbul (I-class) program starting in 2017, with steel cutting for TCG Istanbul (F-515) on 19 January 2017 and keel laying on 3 July 2017. The lead I-class frigate launched in 2021 and was commissioned on 19 January 2024, demonstrating scalability to 3,000-ton displacement vessels with enhanced vertical launch systems. Further milestones include export adaptations, beginning with the 2018 contract for four Ada-class corvettes to Pakistan, where the first, PNS Tughril (F-261), had keel laid in December 2018 and commissioned in June 2022. The project's scope expanded to include TF-2000-class air defense destroyers in design phases post-2020 and Hisar-class offshore patrol vessels as redesigned MILGEM variants, with initial launches projected around 2023. By 2024, approvals for additional I-class frigates (ships 9-12) and integration of advanced propulsion like GE LM2500 engines underscored ongoing evolution toward a comprehensive national warship family.

Design Principles and Technological Features

Core Architectural Innovations

The MILGEM project's core architectural innovations are exemplified in the Ada-class corvettes, which prioritize stealth, survivability, and indigenous design principles to create a versatile littoral combat platform. The hull incorporates low-observable features, including shapes and materials that achieve reduced radar, magnetic, infrared, and acoustic signatures, enabling operations in high-threat environments with minimized detectability. This stealth-optimized superstructure integrates sloped surfaces and signature management techniques, departing from traditional naval architectures to enhance tactical advantages in anti-submarine and patrol missions. Architectural emphasis on seakeeping and stability supports high-speed maneuvers and endurance for multi-mission profiles, including reconnaissance, surveillance, and high-seas operations, while shock-resistant structures improve survivability against underwater threats. The design's indigenous development, initiated in 2005, represents Turkey's first fully national warship architecture, fostering local classification and construction standards that reduce reliance on foreign designs. Scalability forms a key innovation, with the baseline Ada hull—measuring 99 meters in length and displacing approximately 2,300 tons—serving as a modular foundation for larger variants like the Istanbul-class frigates through hull extensions and reinforced decks, without compromising core stealth or propulsion integration. This adaptability, combined with provisions for vertical sensor masts and distributed system layouts, facilitates efficient upgrades and international customization, as seen in export configurations.

Armament, Sensors, and Propulsion Systems

The MILGEM project's ships integrate a mix of indigenous and select foreign systems, emphasizing domestic production for armament, sensors, and propulsion to enhance operational independence and reduce signatures for stealth. Ada-class corvettes feature a primary Oto Melara 76 mm/62 Super Rapid gun for surface and air defense, supported by eight anti-ship missiles with a range exceeding 200 km, and a Mk 49 launcher for 21 RIM-116 Rolling Airframe Missiles (RAM) for point defense against anti-ship missiles and aircraft. Torpedo armament includes two triple Mk 32 tubes firing Mk 46 lightweight torpedoes, while secondary weapons comprise two Aselsan STAMP remotely controlled 12.7 mm machine guns. Istanbul-class frigates advance this with 16 Roketsan ATMACA anti-ship missiles in canister launchers and a 16-cell MIDLAS vertical launch system (VLS) for Hisar surface-to-air missiles (range ~25 km), with upgrades planned for longer-range Siper missiles. The main gun remains a 76 mm dual-purpose system (Leonardo or indigenous equivalent), augmented by two Aselsan 25 mm STOP remote guns and a stern-mounted 35 mm Gökdeniz close-in weapon system (CIWS) for anti-missile and surface threats. Both classes support anti-submarine warfare via 324 mm torpedo tubes compatible with Mk 46, Mk 54, or indigenous Orka torpedoes, often paired with embarked S-70B Seahawk helicopters. Sensors across MILGEM variants prioritize multi-role detection with low observability. Ada-class ships employ the Thales SMART-S Mk 2 3D air/surface search radar (detection up to 250 km for air targets), supplemented by STING EO Mk 2 and an X-band navigation radar, alongside the indigenous TBT-01 Yakamoz hull-mounted sonar for submarine detection. Electronic warfare includes Aselsan ARES-2N electronic support measures (ESM) for threat identification and Ultra Electronics Sea Sentor torpedo defense. Istanbul-class upgrades feature fully indigenous Aselsan HAZAR 3D active electronically scanned array (AESA) radar for surveillance, AKREP , PIRI-KATS infrared search and track (IRST) for 150+ targets, and FERSAH medium-frequency sonar. Additional systems like HIZIR towed torpedo countermeasures and ARAS-2023 diver detection sonar enhance asymmetric threat response, with TÜBİTAK degaussing reducing magnetic signatures. Propulsion adopts a combined diesel and gas (CODAG) configuration for efficiency and sprint capability. Ada-class vessels use one General Electric LM2500 gas turbine (23,000 kW) and two MTU diesels (4,320 kW each), driving twin shafts for a maximum speed of 30 knots and range of 3,500 nautical miles at 15 knots. Istanbul-class maintains this layout with one LM2500 turbine and two MTU 20V 4000 M93L diesels, achieving over 29 knots and extended range of 6,570 nautical miles at 14 knots, with controllable-pitch propellers for maneuverability. These systems support MILGEM's emphasis on reduced acoustic, radar, and infrared signatures through optimized hull forms and equipment selection.

Ship Classes and Variants

Ada-class Anti-Submarine Corvettes

The Ada-class corvettes form the foundational surface combatant series of the Turkish , comprising four anti-submarine warfare-focused vessels commissioned into the Turkish Naval Forces between 2011 and 2019. These ships were constructed at the Istanbul Naval Shipyard to enhance Turkey's littoral and blue-water capabilities, emphasizing stealth design, reduced radar cross-section, and integration of domestically developed technologies. The lead ship, TCG Heybeliada (F-511), was laid down in July 2005, launched in September 2008, and commissioned on September 27, 2011. Subsequent vessels followed: TCG Büyükada (F-512) in 2013, TCG Burgazada (F-513) in 2018, and TCG Kınalıada (F-514) on November 4, 2018. With a full-load displacement of approximately 2,400 tons, the Ada-class measures 99.56 meters in length, 14.4 meters in beam, and 3.9 meters in draft. Propulsion employs a CODAG (combined diesel and gas) system featuring one GE LM2500 gas turbine (23,000 kW) and two diesel engines, enabling a maximum speed of 29-30 knots and a range of 3,500 nautical miles at 15 knots. The design prioritizes anti-submarine operations, supported by sonar suites, torpedo tubes, and helicopter facilities for ASW helicopters, while also accommodating surface-to-air missiles, anti-ship missiles, and a 76 mm main gun for multi-role engagements against air, surface, and subsurface threats. Sensors include the Thales SMART-S Mk2 3D air/surface search radar and indigenous ALPER radar for enhanced detection. The class achieves over 70% indigenous content, including combat management systems, electronic warfare suites, and propulsion elements, aligning with MILGEM's objective of fostering domestic naval industry self-reliance. Crew complement is approximately 106 personnel, with automation reducing manpower needs compared to legacy corvettes. These vessels have participated in international exercises and operations, demonstrating interoperability with NATO allies, such as port visits and joint maneuvers. The Ada design serves as the baseline for export variants, including adaptations for Pakistan and Ukraine, though Turkish units retain ASW-centric configurations.

Istanbul-class (I-class) Multipurpose Frigates

The Istanbul-class (I-class) multipurpose frigates represent an evolution of the 's Ada-class corvettes, scaled up for enhanced multi-role capabilities including anti-surface warfare, anti-air warfare, anti-submarine warfare, and maritime surveillance. These frigates feature a monohull displacement design with stealth optimizations to reduce radar, acoustic, infrared, and magnetic signatures. Approximately 75-80% of components are indigenous, emphasizing Turkey's push for self-reliance in naval production. Key specifications include an overall length of 113.2 meters, beam of 14.4 meters, draft of 4.05 meters, and full-load displacement of around 3,000 tons. The vessels accommodate a crew of 123 and achieve a maximum speed exceeding 29 knots with a range of approximately 5,700 nautical miles at 14 knots. Propulsion employs a combined diesel and gas (CODAG) system comprising two MTU 20V 4000 M93L diesel engines and one GE LM2500 gas turbine driving two shafts with controllable-pitch propellers.
CategoryDetails
DimensionsLength: 113.2 m; Beam: 14.4 m; Draft: 4.05 m
Displacement~3,000 tons (full load)
Speed/Range>29 knots max; 5,700 nm at 14 knots
Crew123
PropulsionCODAG: 2x MTU diesels + 1x LM2500 GT
Armament centers on indigenous systems for versatility: a 76mm Super Rapid main gun, 16 Atmaca Block I anti-ship missiles (range >120 nm), a 16-cell MİDLAS vertical launch system for Hisar surface-to-air missiles (range ~15 nm), 35mm Gökdeniz close-in weapon system, two 25mm STOP remote weapon stations, and two 324mm torpedo tubes. A hangar supports one S-70B Seahawk helicopter for extended anti-submarine operations. Sensors integrate domestic technologies such as the FERSAH hull-mounted sonar, CENK AESA search radar, HAZAR 3D air surveillance radar, AKREP target acquisition radar, PIRI-KATS infrared search and track, ARES-2N electronic support measures, AREAS-2N electronic countermeasures, ARAS-2023 diver detection sonar, and the ADVENT combat management system for sensor fusion and threat response. Eight frigates are planned, with construction distributed across Istanbul Naval Shipyard and Sefine Shipyard to accelerate production. The lead ship, TCG İstanbul (F-515), was launched on 23 January 2021 and commissioned on 19 January 2024 after completing sea trials and acceptance tests. Subsequent vessels include the second and third ships launched in January 2025, and the fourth, TCG İçel (F-518), launched on 1 September 2025, with seven under construction and four more contracted as of late 2025.

TF-2000-class Air Defense Destroyers

The represents the air defense warfare (AAW) component of Turkey's MILGEM project, designed to provide fleet-level protection against aerial threats including guided missiles and ballistic missiles. These vessels are intended to serve as the primary AAW escorts for Turkish naval task groups, with capabilities for detecting and engaging low-, medium-, and high-altitude targets at short, medium, and long ranges. The class emphasizes indigenous design and production to enhance Turkey's self-reliance in naval defense systems. With a displacement of approximately 8,300 tons, the TF-2000 measures 149 meters in length, featuring a beam of around 21 meters and a draft of 5-6 meters. Propulsion employs a combined diesel or gas (CODOG) system, enabling maximum speeds exceeding 26 knots and a cruising speed of 17 knots, supported by two gas turbines and diesel engines for operational flexibility. The design incorporates stealth features, such as reduced radar cross-section through angular hull lines and integrated mast structures housing sensors. Armament centers on a vertical launch system (VLS) with 96 cells capable of accommodating Turkish-developed surface-to-air missiles like SIPER for extended-range air defense and Hisar variants for shorter threats. A 127 mm main gun provides surface fire support, supplemented by anti-ship missiles, close-in weapon systems, and torpedo tubes for multi-role operations. Sensor suite includes the indigenous CAFRAD active electronically scanned array (AESA) radar for 360-degree air and surface surveillance, integrated with electronic warfare and fire control systems to enable autonomous threat engagement. The class is planned for a crew of 130-150 personnel, with automation reducing manning requirements compared to legacy destroyers. Development of the TF-2000 began in the early 2010s under the Turkish Naval Research Center, with detailed design phases advancing through the 2020s amid MILGEM's phased expansion. Construction of the lead ship commenced on January 2, 2025, under ASFAT, Turkey's defense procurement agency, with steel cutting scheduled for November 2025 at an Istanbul shipyard. The first vessel is targeted for launch in 2028 and delivery to the Turkish Navy by 2030, forming part of a planned series of up to eight ships to replace aging vessels and bolster fleet air defense. This timeline reflects accelerated indigenous integration following international procurement challenges in prior MILGEM phases.

Hisar-class Offshore Patrol Vessels

The Hisar-class offshore patrol vessels (OPVs) represent a cost-effective variant within Turkey's MILGEM national shipbuilding program, designed primarily for maritime patrol, surveillance, and escort missions in littoral and offshore environments. Developed by ASFAT, a Turkish defense procurement agency, these vessels adapt elements of the design, including a modified hull form and layout optimized for extended patrols rather than full anti-submarine warfare capabilities. Each displaces approximately 2,300 tonnes, with dimensions of 99.5 meters in length, 14.4 meters in beam, and 3.8 meters in draft, enabling operations in contested waters while prioritizing endurance over high-speed combat. Propulsion employs a CODELOD (Combined Diesel-Electric or Diesel) system, comprising diesel engines for high-speed transits and electric motors for efficient low-speed patrolling, achieving a maximum speed of 24 knots and supporting sustained deployments. Armament focuses on self-defense and patrol enforcement, including an indigenous 76 mm naval gun system produced by Makina ve Kimya Endüstrisi (MKE), with potential configurations for vertical launch systems (VLS) on later units to enhance anti-air capabilities. Sensor suites emphasize radar and electro-optical systems for surface surveillance, though specifics remain classified pending full integration during trials. Construction of the lead ship, , began in April 2022 at Naval Shipyard, with sea trials commencing on December 13, 2024, and delivery to the Turkish Navy targeted for 2025. The second vessel, TCG Koçhisar, was laid down on December 10, 2022, launched on September 23, 2023, and remains under fitting-out as of late 2024, also slated for 2025 delivery. Subsequent units, including a third vessel under construction by DESAN Shipyard, upgraded superstructures and VLS integration for improved modularity, with deliveries planned for 2028–2029 under a led by DESAN and Dearsan. The class supports Turkey's goal of indigenous naval production, with initial plans for up to four vessels for the Navy, though expansions to ten have been discussed to bolster patrol capacity amid regional tensions.

Exports and International Collaboration

Pakistan Navy Contracts

In July 2018, Pakistan signed a contract with Turkey's ASFAT for the construction of four MILGEM-class corvettes, adapted from the Ada-class design, marking Turkey's largest single military export deal at the time with an estimated value of USD 1 billion. The agreement stipulated that two vessels would be built at Istanbul Naval Shipyard in Turkey, while the remaining two would be constructed at Karachi Shipyard & Engineering Works (KS&EW) in Pakistan, incorporating technology transfer to enhance local shipbuilding capabilities. The program, designated as PN MILGEM or Babur-class by the Pakistan Navy, commenced with the keel-laying of the lead ship, PNS Tughril (F-261), in December 2018 at Istanbul Shipyard; it was launched in 2021 and commissioned into service in June 2022, featuring enhanced armaments including vertical launch systems for surface-to-air missiles compared to Turkish Ada-class baselines. The second ship, PNS Babur, followed with construction starting in 2020 at the same Turkish yard, achieving launch in August 2021 and entering operational trials by mid-2024, equipped for multi-role missions including anti-submarine warfare and air defense. Construction of the third vessel began in November 2022 at Istanbul Shipyard, with delivery targeted for 2024, while the fourth, PNS Tariq (F-283), was launched in Pakistan in August 2023 at KS&EW, reflecting partial localization of assembly processes under the deal's offset requirements. Initial projections anticipated all four ships entering service by 2024-2025, though minor delays in local builds were reported due to supply chain integration; by early 2025, three vessels were operational or nearing commissioning, bolstering Pakistan's surface fleet with indigenous sustainment potential.

Ukrainian Ada-class Acquisition


In December 2020, Ukraine signed a framework agreement with Turkey for the acquisition of two Ada-class corvettes as part of the , aimed at bolstering Ukrainian naval capabilities in the Black Sea and Sea of Azov. The deal involves co-production between Turkish state-controlled defense firm STM and a Ukrainian shipyard, with the vessels intended to enhance anti-submarine and surface warfare roles. The first corvette, Hetman Ivan Mazepa (F-211), was launched by RMK Marine in Istanbul on October 2, 2022. Construction progressed amid Ukraine's ongoing conflict with Russia, with the ship completing sea trials and live-fire exercises by November 2024, demonstrating firepower from its integrated weapon systems. The second vessel, Hetman Ivan Vyhovskyi, followed with its launch at Istanbul Shipyard on August 1, 2024. Both ships are expected to undergo further outfitting, with Vyhovskyi slated for maiden voyage in 2026 and delivery to Ukraine in the first quarter of 2027. As of late 2024, Ukraine's Ministry of Defence expressed intentions to procure two additional Ada-class corvettes by 2030, building on the initial contract to further expand its surface fleet despite wartime constraints. This acquisition underscores Turkey's role in supporting Ukrainian naval modernization through technology transfer and joint production, though full operational integration remains dependent on post-conflict stability.

Indonesian Istif-class Deal

![TCG Istanbul (F-515), lead ship of the Istif-class][float-right] On July 26, 2025, Indonesia's Ministry of Defense signed a contract with the Turkish consortium TAIS Shipyards for the acquisition of two MILGEM Istif-class multirole frigates, marking the first export sale of this warship class. The agreement was formalized during the IDEF 2025 defense exhibition in , with the frigates designed as 3,100-ton stealth vessels derived from Turkey's -class frigates under the MILGEM program. The deal, valued at approximately $1 billion, involves comprehensive cooperation including engineering, manufacturing, and potential technology transfer, aimed at enhancing Indonesia's naval capabilities amid its modernization efforts. Indonesia's state-owned shipbuilder PT PAL is expected to participate, supporting local production elements and integration of systems. Each frigate costs around $500-550 million, equipping the with advanced multirole platforms featuring indigenous Turkish sensors and armaments adapted for export. This transaction represents a milestone for Turkey's defense industry, demonstrating the MILGEM project's export viability beyond Ada-class corvettes sold to Pakistan and Ukraine, and strengthening bilateral defense ties between Ankara and Jakarta. The Istif-class frigates, with the Turkish lead ship TCG Istanbul commissioned in January 2024, incorporate upgraded propulsion, vertical launch systems, and anti-submarine warfare capabilities compared to earlier MILGEM variants. Delivery timelines remain unspecified in public announcements, but the contract prioritizes operational readiness for Indonesia's archipelagic defense needs.

Emerging Interest from Other Nations

The Royal Thai Navy has expressed interest in acquiring MILGEM-class frigates as part of its fleet modernization program, which includes procuring up to four new vessels to replace aging assets. In February 2025, Turkish officials from ASFAT, a state-owned defense procurement agency, engaged with Thai counterparts, including United Defense Technology (UDT), to propose tailored MILGEM designs featuring technology transfer and potential local co-production. This initiative aligns with Thailand's fiscal 2026 budget allocation of approximately 17.5 billion Thai baht (about $530 million USD) for one frigate, aiming for a total of eight frigates in service. Technical specifications for the Thai requirement are slated for finalization between June and July 2025, positioning Turkish MILGEM variants, such as the Istanbul-class, as competitive options emphasizing multi-mission capabilities including anti-submarine warfare and surface combat. Bangladesh has previously indicated interest in MILGEM corvettes, particularly for enhancing its offshore patrol and multi-role capabilities, though no firm commitments have materialized amid competing bids from other nations. Reports from 2021 highlighted Bangladesh shortlisting Turkish shipyards alongside Chinese, Dutch, and Italian firms for a $2.5 billion frigate program, but subsequent developments favored alternative platforms, with retractions of earlier Istanbul-class acquisition rumors. Interest from South American navies, including potential evaluations by Peru and others, dates back to the early phases of the MILGEM program but remains exploratory without recent procurement advancements. In Morocco, 2022 negotiations reportedly explored acquiring one for anti-submarine roles alongside fast attack craft, driven by needs for Blue Water capabilities, yet no confirmed deals or progress have been reported since. These inquiries underscore the MILGEM project's appeal for cost-effective, domestically developed vessels with high indigenous content, though geopolitical alignments and financing constraints often influence outcomes.

Challenges, Criticisms, and Resolutions

Procurement Delays from Foreign Embargoes

The MILGEM project's reliance on foreign-sourced components for critical systems exposed it to procurement disruptions from international embargoes, particularly following Turkey's acquisition of Russian S-400 air defense systems in 2019. The U.S. imposed sanctions under the Countering America's Adversaries Through Sanctions Act (CAATSA) on December 14, 2020, targeting Turkey's Presidency of Defense Industries (SSB) and restricting exports of defense articles, which directly affected planned integrations for the Istanbul-class frigates. A primary impact was the denial of export licenses for the U.S.-made Mk 41 vertical launch system (VLS), originally intended for the Istanbul-class to enable multi-missile capabilities. This led to the abandonment of the Mk 41 in favor of domestically developed alternatives by Roketsan, necessitating design modifications and testing that postponed outfitting timelines. The first Istanbul-class frigate, TCG Istanbul (F-512), faced extended delays in weapon system integration, contributing to its commissioning slipping to January 19, 2024, years after its 2017 keel laying. Additional components, including the U.S. Rolling Airframe Missile (RAM) system for close-in defense and potentially main guns or CIWS, encountered similar export hurdles under CAATSA and unofficial restrictions from NATO allies, further complicating schedules for subsequent MILGEM variants like the TF-2000 destroyers. These embargoes, while accelerating indigenous production efforts—such as Roketsan's VLS achieving initial operational capability—imposed short-term delays estimated in years for system maturation and certification. Reports indicate that parallel challenges with European suppliers, including unconfirmed halts on German MTU engines for propulsion upgrades, compounded integration issues across the project, though primary delays stemmed from U.S. restrictions.

Domestic Production Hurdles and Criticisms

Despite significant progress in hull design, construction, and integration of domestic electronics, the MILGEM project has encountered persistent hurdles in fully indigenizing propulsion and sensor systems, with Ada-class corvettes depending on foreign diesel engines from MTU Friedrichshafen GmbH, a German firm, for their CODAD configuration. This reliance, evident in the first four ships commissioned between 2011 and 2019, underscores technological gaps in high-power marine diesel development, where Turkish efforts like those by BMC Power have yet to fully mature for serial production as of 2025. Indigenization rates have incrementally improved, starting at around 15% for TCG and reaching 72% for subsequent Ada-class vessels, with Istanbul-class (I-class) frigates targeting 75%, yet critics argue these figures overstate true domestic content by including licensed foreign assemblies and overlook vulnerabilities to export restrictions on critical imports like ms. Domestic production has also grappled with supply chain bottlenecks and workforce skill shortages in precision engineering, leading to integration delays during sea trials for early Ada-class ships, where system compatibility issues extended timelines beyond initial projections from the 2005 program launch. Cost overruns and early quality control lapses, such as in welding standards and subsystem reliability, have drawn scrutiny from analysts, who attribute them to the challenges of scaling an inexperienced industrial base amid Turkey's economic volatility, including inflation spikes that inflated material costs by over 50% in the 2018-2022 period. Opposition figures and independent assessments have criticized the program's efficiency, labeling localization claims as inflated for political gain and highlighting inefficiencies in coordinating over 200 subcontractors, which have resulted in redundant efforts and uneven quality across shipyards like those of Istanbul Naval Shipyard and Anadolu Shipyard. These issues, while mitigated through concurrent builds to distribute risk, reflect broader maturation pains in Turkey's defense sector, where ambitious targets for self-reliance have occasionally prioritized quantity over refined technological depth.

Political Controversies and International Skepticism

The MILGEM project's execution has faced domestic political scrutiny, particularly regarding the 2013 decision to cancel RMK Marine's contract for constructing six additional Ada-class corvettes, originally awarded to the private shipyard owned by Koç Holding. This abrupt shift transferred work to state-controlled facilities amid tensions following the Gezi Park protests, with reports indicating government pressure on Koç for allegedly providing shelter to demonstrators, framing the move as retaliation against perceived opposition alignment. Critics, including opposition voices, argued this exemplified politicization of defense procurement, prioritizing loyalty over efficiency and risking delays in a program already strained by funding shortfalls since its 1996 inception. Such interventions have fueled broader accusations that the Justice and Development Party (AKP) government under President Erdoğan leverages MILGEM for nationalist propaganda, portraying indigenous shipbuilding as a symbol of self-reliance while downplaying persistent delays and cost overruns. For instance, construction timelines for follow-on vessels extended beyond initial projections, with only four Ada-class corvettes delivered to the Turkish Navy by 2019 despite plans for eight, prompting claims of overambitious political timelines detached from industrial realities. These domestic debates highlight tensions between rapid militarization goals and accountability, though supporters counter that state oversight ensured progress amid private sector unreliability. Internationally, skepticism toward MILGEM has arisen from Turkey's strained NATO relations, exacerbated by its 2019 S-400 acquisition from Russia, which triggered U.S. CAATSA sanctions and expulsion from the F-35 program on December 17, 2020. This has cast doubts on the interoperability of Turkish-built vessels with Western systems, as potential buyers weigh risks of technology transfer restrictions and supply chain vulnerabilities in allied operations. Despite successful exports—such as Pakistan's four corvettes under a 2018 deal and Ukraine's Ada-class agreement in 2022—Western analysts express reservations about long-term reliability, citing Turkey's independent foreign policy as a barrier to deeper collaboration; for example, U.S. procurement channels remain closed to Turkish shipyards due to embedded domestic preferences and geopolitical frictions rather than technical deficiencies. These concerns persist even as MILGEM demonstrates NATO-standard capabilities in benchmarks, underscoring how political divergences overshadow empirical performance metrics.

Strategic and Economic Impact

Enhancement of Turkish Naval Capabilities

The MILGEM project has significantly bolstered Turkish naval capabilities by delivering indigenous corvettes and frigates optimized for multi-role operations, including , , and air defense. Launched in 2004, the program prioritizes self-sufficiency in shipbuilding, incorporating domestic sensors, weapons, and propulsion systems to reduce reliance on foreign suppliers. This has enabled the Turkish Navy to field platforms with enhanced endurance, stealth features, and integration of systems like the Roketsan ATMACA anti-ship missile on Ada-class corvettes. The Ada-class corvettes, the initial phase of MILGEM, consist of four vessels commissioned between 2011 and 2019: TCG Heybeliada (F-511), TCG Büyükada (F-512), TCG Burgazada (F-513), and TCG Kınalıada (F-514). These 2,300-ton ships feature advanced electronic warfare suites, sonar systems for ASW, and vertical launch systems in later upgrades, providing littoral dominance and blue-water projection. Their design emphasizes low observability through composite materials and reduced magnetic signatures via degaussing systems developed by TÜBİTAK BİLGEM. Complementing the Ada class, the Istanbul-class (I-class) frigates represent an evolution with enlarged hulls offering 50% greater fuel capacity and operational range compared to their corvette predecessors. Eight frigates are planned, with TCG İstanbul (F-515) commissioned in 2024 and featuring MIDLAS vertical launching systems for indigenous air defense missiles, enabling full-spectrum combat including anti-air warfare. Equipped with national radar and combat management systems, these 3,000-ton vessels enhance fleet-wide multi-threat engagement and support extended patrols in contested regions. Overall, MILGEM's integration has modernized approximately 20% of Turkey's surface combatants with platforms capable of reconnaissance, early warning, and underwater operations, replacing aging foreign-designed ships and aligning with NATO interoperability while prioritizing domestic innovation. This has extended operational reach and resilience against embargoes, contributing to Turkey's strategic posture in the Mediterranean and Black Sea.

Industrial Self-Reliance and Export Successes

The MILGEM project has significantly advanced Turkey's naval self-reliance by prioritizing indigenous design, construction, and systems integration, reducing dependence on foreign suppliers amid historical embargoes such as the 1974 U.S. arms restriction. Launched in 2004 under Turkish Navy management, the program targeted 75% local content for its initial Ada-class corvettes, a threshold exceeded at 80% through domestic development of hulls, propulsion, electronics, and weapons by firms like STM and ASFAT. Subsequent Istanbul (I)-class frigates achieved up to 80% indigenization, incorporating locally produced sensors, combat management systems, and vertical launch systems, thereby building a robust domestic supply chain involving over 200 subcontractors. This localization effort has fostered technological depth in Turkey's defense sector, enabling serial production across state and private shipyards like Istanbul Shipyard and RMK Marine, with simultaneous construction of multiple vessels as of 2025. The program's scalability—from corvettes to frigates—has supported broader self-sufficiency goals, including domestic engine and radar development, positioning Turkey as a net exporter of naval platforms rather than a perpetual importer. Export achievements underscore MILGEM's commercial viability, with deals to Pakistan (four Babur-class corvettes valued near €1 billion), Ukraine (two Ada-class units), and Indonesia (two Istif-class frigates at approximately $1 billion), demonstrating adaptability to client requirements while retaining high indigenous components. These contracts, secured since 2018, have generated revenue streams that offset R&D costs and elevated Turkey's global market share, contributing to defense exports surging from $2.3 billion in 2020 to $8 billion by 2025. MILGEM's export success reflects proven mpetitiveness, attracting interest from nations seeking alternatives to Western suppliers, though sustained growth depends on maintaining quality amid geopolitical tensions.

Broader Geopolitical Implications

The MILGEM project has bolstered Turkey's strategic autonomy in defense procurement, enabling the country to mitigate vulnerabilities from foreign embargoes and supply disruptions, such as those imposed by the United States following Turkey's acquisition of Russian S-400 systems in 2019. By achieving over 70% indigenous content in Ada-class corvettes, MILGEM reduces reliance on NATO-standard imports, allowing Turkey to sustain naval operations independently amid geopolitical frictions within the alliance. This shift supports Turkey's "Blue Homeland" doctrine, projecting power in contested areas like the Eastern Mediterranean and Black Sea, where energy exploration disputes with Greece and Cyprus heighten naval requirements. Exports of MILGEM-derived vessels, including four Ada-class corvettes to Pakistan commissioned between 2019 and 2023, have expanded Turkey's influence in South Asia, fostering defense ties that counterbalance Indian naval dominance in the Indian Ocean region. Similarly, the 2023 agreement with Ukraine for two MILGEM-based corvettes, with construction underway in Turkish shipyards as of 2024, aids Kyiv's post-invasion maritime recovery while positioning Ankara as a key non-Western supplier to NATO's eastern flank, complicating Russia's Black Sea control. The 2025 Istif-class frigate deal with Indonesia marks Turkey's first such export to Southeast Asia, enhancing bilateral strategic cooperation and challenging established exporters like South Korea in emerging markets. These developments signal Turkey's emergence as a pivotal arms exporter, with defense sales rising 20-30% annually since 2020, leveraging MILGEM's proven designs to build economic dependencies and diplomatic leverage in Africa and the Middle East. In NATO contexts, MILGEM's interoperability with alliance standards positions Turkey to offer cost-effective platforms to budget-constrained members, potentially easing alliance strains while underscoring Ankara's pivot toward multi-vector partnerships that dilute exclusive Western influence. Overall, the project amplifies Turkey's role in reshaping maritime power dynamics, from securing trade routes to the Indian Ocean to contesting resource claims in the Mediterranean, thereby elevating its geopolitical weight beyond regional confines.

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