Smoke screens created by electrically firing armored tube launchers mounted on turret sides (one on top of barrel is Hoffman Device : multi-tube concussion launcher used to simulate tank fire during training exercises). Rollover : Diesel fuel can also be injected into the exhaust system to create a heavy cloud of white smoke, ejected from rear vents (black vent cover on model). Small chevron on engine cover indicates US 1st Armored Division / I. Battalion unit. M1 Abrams + HBlock-X Music - youtube.com/watch?v=hk9BiypNxQM

Original armor protection is a form of laminate Chobham armor (also used in German Leopard 2 and British Challenger MBTs), which is a "semi-mobile matrix of aluminum, plastics, and glues." This technology used physics and kinetics as defensive advantages. Chobham armour - en.wikipedia.org/wiki/Chobham_armour

By 1988, steel-encased depleted uranium mesh was integrated into the armor, which increased both armor protection but also vehicle weight. Nuclear, biological and chemical (NBC) protection included into the air filtration system. NBC protection - en.wikipedia.org/wiki/Nuclear,_Biological,_Chemical

Abram's performance in 1991 Operation Desert Storm showed its technological superiority to Russian-built Iraqi T-72 tanks by outranging the enemy guns by at least 1,000 meters. Iraq tankers attempted to negated this range advantage by driving full speed directly into US armor formations. At close range, one-shot one-kill principle benefits both allies and enemies alike. This tactic was used by Soviet armor forces against the Germans in the famed Prokhorovka tank battle - Kursk Salient 1943. T-72 - en.wikipedia.org/wiki/T-72