The first generation of American semi-automatic rifles granted Americans unmatched firepower against Japanese, French, Balkan, Soviet, Korean and Chinese troops which were largely equipped with bolt-action rifles.
The M2 Carbine is exactly the same as its predecessor which bears the designation M1, a lightweight rifle in .30 Carbine which is meant for use by rear-echelon troops. However, the M2 includes a selective fire switch, which means it can fire in fully automatic when a soldier finds themselves in a pinch. Because of its niche in Oceanyka (a weapon for tight spaces), the M2 is almost always preferred over its predecessor. Most military historians agree that the M2 Carbine is an early predecessor to American assault rifles such as the M16A1.