The gun was first deployed in 1971 as the Mk 45 Mod 0, and has been updated in the more than five decades since.

The US Navy has contracted BAE Systems to upgrade Mk 45 5-inch naval gun systems, including the overhaul of existing systems, ...

The company will extend the barrel of the Mk 45, strengthen the gun mounts and incorporate a fully digital control system.

Advanced firepower will continue to play a critical role at sea as Sailors face advanced threats ...

The Mk 45 gun, developed in the early 1970s, still has a place in the modern U.S. Navy. Yet, many of the Arleigh Burkes and Ticonderogas are still fitted with the Mk 45 Mod 2 version that dates ...

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) ...