160323-N-ZZ999-303 WASHINGTON (March 1, 2016) Sailors assigned to the gunnery department of the U.S. Navy tugboat USS Conestoga (AT 54), top, pose with the tugboat's main battery, a 3-inch/50-caliber naval gun, in San Diego, Calif., in 1921. The lower photograph shows the current position of the gun inside the shipwreck near the forecastle after the gun's support platform had fallen from its original position in front of the pilot house through the main deck. The gun was a key diagnostic artifact that served to identify the wreck as Conestoga. (U.S. Navy photo courtesy of NOAA/Released)