The MEC trooper represented a heavily armored and weaponized specialist group of clone trooper variations that saw action throughout the Clone Wars.
Within the MEC category were included clone commandos, Galactic Marines, as well as clone paratroopers. The MEC class encompassed some of the most expertly trained combat forces within the Grand Army of the Republic.
Players could encounter MEC troopers in Star Wars Battlefront: Renegade Squadron and Star Wars Battlefront: Elite Squadron. In these games, the customization options allowed players to design a clone trooper with a disproportionately large physique, designated as a MEC trooper. When using this body type, players could select from three head options: clone commander Bacara's helmet, a clone paratrooper helmet, or the helmet of a clone commando. Beyond this, no further details were provided regarding this clone trooper type, including the meaning of the "MEC" acronym.