USS Maryland (BB-46)
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USS Maryland (BB-46), also known as "Old Mary" or "Fighting Mary" to her crewmates, was a Colorado-class battleship. She was the third ship of the United States Navy to be named in honor of the seventh state. She was commissioned in 1921, and serving as the flagship of the fleet, cruised to Australia, New Zealand, and Brazil.
USS Maryland (BB-46) underway in 1935
Secretary of State Charles Evans Hughes (at left) and Admiral Hilary P. Jones, Commander in Chief, U.S. Atlantic Fleet on board Maryland in August 1922
Maryland alongside the capsized Oklahoma during the attack on Pearl Harbor, as West Virginia burns in the background
Maryland in February 1942, after the completion of her repairs
Barbette
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Barbettes are several types of gun emplacement in terrestrial fortifications or on naval ships.
US Army 16-inch gun M1919 on barbette mount M1919; this was a high-angle mount with elevation to 65°.
Illustration of several armored ships from the 1880s, showing the degree of experimentation with armament arrangements
USS Maryland under construction in 1917, showing the forward two barbettes without the gun turrets installed
Rear "Cheyenne"-pattern gun position on a B-17G Flying Fortress