The AIFV (Armored Infantry Fighting Vehicle) is an American tracked light armored vehicle that serves as an infantry fighting vehicle (IFV) in the armies of several countries. It is a development of the M113A1 armored personnel carrier.

In 1967, funded by the United States Army, the FMC Corporation produced two prototype vehicles designated as XM765 – these were based on their experiences with the earlier XM701 vehicle, developed for the MICV-65 program. The XM765 was based on the M113A1, upgraded with an enclosed turret and firing ports, so that the infantry could fight from within the vehicle. The Army evaluated the vehicle, but decided that they wanted a better protected and more mobile vehicle, selecting instead the M2 Bradley.

FMC continued development as a private venture, resulting in the product improved (PI) M113A1 in 1970. The PI M113A1 had the driver and engine at the front, with an enclosed weapon station in the center of the hull and the commander seated at the rear. This arrangement meant that the commander had a very poor forward view. FMC went back to the drawing board and came up with a new design, which had the driver on the front left of the hull and the commander seated behind him. To the right of the commander was a one-man turret. The vehicle would later be designated the AIFV (armored infantry fighting vehicle).^{[citation needed]}

While the US was uninterested in the design, a number of other governments were interested in the vehicle, which was simpler, lighter, and cheaper than the Bradley.

After a series of demonstrations and the delivery of four evaluation vehicles in 1974, the Netherlands government placed an order for 880 of the vehicles in 1975, which were designated YPR-765 when they entered service. Some changes were made at the request of the Dutch government, including shifting the weapon station to the right side and moving the commander behind the driver. The Netherlands ordered 2,079, of which 815 were produced locally under license. Under the YPR-2000 program, virtually all Dutch vehicles were upgraded to YPR-765A1 standard and are easily identified by the 3-tone NATO camouflage pattern^{[clarification needed]}. During the war in Afghanistan, several vehicles were fitted with additional armor.^{[citation needed]}

The Philippines also received 45 vehicles in 1979, these were intended to take 25mm cannons, although some were later modified to fit 12.7mm machine guns.^{[citation needed]}

In 1979, Belgium placed an order for 514 AIFV-B (to be produced locally) along with 525 M113A-B (similar to the M113A2). The first vehicles were delivered in 1982.^{[citation needed]}

Turkey selected the AIFV in 1989, after a competition involving the Alvis Vickers Warrior IFV, Krauss-Maffei PUMA and United Defense LP Armoured Infantry Fighting Vehicle. The total value of the contract for 1,698 vehicles was US$1.076 billion. The first 285 hulls were produced in Belgium, the remaining vehicles were produced entirely in Turkey. A little way into the production run, with 200 vehicles completed, the Turkish AIFV specification was updated to include a more powerful powerpack developing 300 horsepower, an Allison X-200-4 transmission and hydrostatic steering from the M113A3. During the production run, a number of changes were made to the armament of the vehicle, including different turret packages, and powerpacks.^{[citation needed]}