The Fuerzas Especiales (Special Forces), commonly known as FES is a special operations group of the Mexican Naval Infantry Corps (the 'Mexican Marines') under the Mexican Navy, established in 2001. Within the Naval Infantry Corps the FES falls under the Mexican Navy Special Operations Unit (UNOPES) which additionally includes various Naval Infantry Corps commando and airborne units.

FES personnel are capable of carrying out non-conventional warfare in the air, sea and land, using all means of infiltration available to develop the most variable operational incursions with the use of military diving techniques, parachuting, vertical descent, urban combat, sniping and use of explosives. The units are well organized, trained and equipped to operate independently in maritime, lake, riverine or terrestrial scenarios.

The FES has played a major active role in the war against international cartels by undertaking direct action missions, intelligence gathering, reconnaissance operations, weapons and facility seizures, kill or capture missions with support from U.S. government agencies such as the DEA.

Some of their most known operations are as follows:

In order to become part of the Special Forces the contestant must pass a basic special forces course. The course has a duration of 1571 hours that is divided in 6 phases:

After passing the basic special forces course the operator continues to receive the additional training in the following areas:

Some of the main training centers and subcenters where courses are given:

Additional training is also given to FES operators in the United States.