50 caliber machine gun had been rendered obsolete by ... In 1952 GE produced three different guns; .60 caliber, 20mm, and 27mm. After extensive testing, the 20mm version was selected for further ...
50 caliber machine guns; two MK 19 40mm automatic grenade launchers; two M-60 machine guns Speed: 35 knots Crew: Four officers, 24 enlisted personnel. The primary mission of these ships is coastal ...