.45ACP

The .45ACP is a form of handgun ammunition that was created by America during World War I, and was utilized in several weapons of American origin.

Soviet Union
Despite being American made, the Soviets utilized this ammunition during the San Hieronymo Incident.

America
Naked Snake utilized this handgun ammo at the start of Operation Snake Eater, largely because of the mission requirement to assassinate The Boss due to her defection.

Various FOX soldiers also utilized this ammo during the San Hieronymo Incident.

Solid Snake later utilized the ammo for the SOCOM pistol, as well as for the Springfield Operator.