.32ACP

The .32ACP is a form of ammunition that was created in America. However, it was utilized for weapons such as the Scorpion.

Soviet Union
During Operation Snake Eater, various GRU soldiers utilized the .32ACP round for their Scorpion submachine guns.

America
Aside from Naked Snake utilizing .32ACP ammo during Operation Snake Eater, various soldiers under Gene's command utilized them during the San Hieronymo Incident.