US grenade launchers: M79, M203, and M320 - 57

In an effort to provide the US infantryman with more firepower to cover the range gap between the hand grenade and the light mortar, the 40mm M79 grenade launcher - a shoulder-fired, single-shot weapon - entered service with US forces in 1961.

Reliable, easy to use, and lethally effective, the M79 soon became an iconic symbol of the Vietnam War and had a profound influence on small-unit tactics.

As the Vietnam conflict continued, it was joined on the front line by experimental models such as the magazine-fed T148E1, as well as two launchers intended to be fitted under the barrel of the new M16 assault rifle: Colt's XM148 and AAI Corporation's M203.

The M203 remains in US Army service today, while the US Marine Corps now also fields the M32 multiple grenade launcher - like the M79, a standalone weapon.