The Mk 45 was designed as a replacement for the Mk 42 five-inch/54 caliber gun mount that was introduced in the early stages of the Cold War as a dual-purpose air/surface platform. According to ...

The Mk 45 Mod 4 upgrade will incorporate a longer 62-calibre barrel and reinforced gun mount, alongside a fully digital control system that seamlessly integrates with existing targeting and fire ...

American missiles were used to engage most of the enemy targets, but the destroyer was forced to employ the five-inch gun against one of the drones.

The destroyer Rafael Peralta fires its Mark 45 5-inch light-weight gun during a live-fire exercise while operating in the Philippine Sea in January 2023. (MC1 Greg Johnson/U.S. Navy) The U.S. Navy ...