USS O-13
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USS O-13, also known as "Submarine No. 74", was one of 16 O-class submarines of the United States Navy commissioned after the end of World War I.
USS O-13 in 1918, with crew in dress whites lined up on deck
3-inch/23-caliber gun
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The 3-inch/23-caliber gun was the standard anti-aircraft gun for United States destroyers through World War I and the 1920s. United States naval gun terminology indicates the gun fired a projectile 3
A 3"/23-caliber gun being fired aboard the United States Navy submarine chaser USS SC-291 sometime between 1918 and 1920.
Plan and left elevation diagrams