The battleship USS Arizona (BB-39), modernized at NNSY from 1929 to 1931, was destroyed during the Dec. 7, 1941 attack on Pearl Harbor. An 1,800-pound bomb triggered a massive explosion and sunk the ship with more than 1,000 crewmembers trapped inside. This photo shows the Arizona three days after the attack. Photos Courtesy of Marcus W. Robbins, Shipyard Historian