Works in a variety of production areas assisting higher grade heavy mobile equipment mechanics or repairers, in the disassembly, repair, replacement, overhaul, modification, and alignment of major components and systems for combat vehicles, such as, but not limited to, engines, transmissions, and fuel and electrical systems. The U.S. Army Tank-automotive and Armaments Command (TACOM) sustains the Army's mission to develop, acquire, field, and sustain ground combat, tactical, and support systems throughout their lifecycle.