page_title: 5"/54 caliber Mark 45 gun
section_title: Operators
hierarchical_section_title: 5"/54 caliber Mark 45 gun / Operators
caption_attribution_description: English: ATLANTIC OCEAN (Oct. 13, 2009) Sailors load 70-pound shells into the 5-inch/54-caliber (Mk 45) lightweight gun aboard the guided-missile destroyer USS Cole (DDG 67). Cole is participating in Exercise Joint Warrior 09-2, a United Kingdom-led, multinational exercise designed to improve interoperability between allied navies as well as to prepare for a role in combined operations during upcoming deployments. (U.S. Navy photo by Mass Communication Specialist 3rd Class Matthew Bookwalter/Released)
context_page_description: The 127 mm /54 caliber lightweight gun is a U.S. naval artillery gun mount consisting of a 127 mm L54 Mark 19 gun on the Mark 45 mount. It was designed and built by United Defense, a company later acquired by BAE Systems Land & Armaments, which continued manufacture.
  The latest 62 calibre long version consists of a longer-barrel L62 Mark 36 gun fitted on the same Mark 45 mount. The gun is designed for use against surface warships, anti-aircraft and shore bombardment to support amphibious operations. The gun mount features an automatic loader with a capacity of 20 rounds. These can be fired under full automatic control, taking a little over a minute to exhaust those rounds at maximum fire rate. For sustained use, the gun mount would be occupied by a six-man crew below deck to keep the gun continuously supplied with ammunition.
caption: Loading a 70-pound (32 kg) 5-inch round in the below-deck gun mount
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