File:U.S. Navy crewmen change the barrel of a 5in 54 caliber Mark 42 gun, at Da Nang, in April 1972.jpg
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![File:U.S. Navy crewmen change the barrel of a 5in 54 caliber Mark 42 gun, at Da Nang, in April 1972.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/9/90/U.S._Navy_crewmen_change_the_barrel_of_a_5in_54_caliber_Mark_42_gun%2C_at_Da_Nang%2C_in_April_1972.jpg/585px-U.S._Navy_crewmen_change_the_barrel_of_a_5in_54_caliber_Mark_42_gun%2C_at_Da_Nang%2C_in_April_1972.jpg?20240331184157)
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