combatant and transport ship classes. The gun is still in use with the Spanish Navy on Serviola-class patrol boats. The US Navy's first 3 inch /50-caliber gun
VC2-M-AP4 were armed with a 5-inch (127 mm)/38 caliber stern gun for use against submarines and surface ships, and a bow-mounted 3-inch (76 mm)/50 caliber gun
targets should battle damage disrupt communication with the ship's primary or auxiliary fire control centers. The firing switchboard allowed any remaining