The Arleigh Burke-class destroyer USS Roosevelt (DDG-80), shoots its Mark 45 5-inch/54-caliber lightweight gun, on June 26, 2026. The Mark 45 Naval Gun is the largest deck gun in use on the US Navy’s warships, and the Navy will pay $38.2 million to overhaul two of them. (US Navy/Mass Communication Specialist 1st Class Brandon Williams-Church)

The US Navy Is Paying $38.2 Million to Overhaul Two Deck Guns

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BAE Systems will overhaul two MK 45 Mod 4 naval guns at its facility in Louisville, Kentucky.

The US Navy will pay BAE Systems $38.2 million to overhaul two MK 45 Mod 4 naval guns.

The multi-mission MK 45 Mod 4 Naval Gun System is the lightest, most compact, widely deployed 27 mm gun in service today. More than 260 units have been delivered to the US Navy, which uses them as the main armament on its Arleigh Burke-class destroyers and Ticonderoga-class cruisers, and nearly a........

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