The USS Arizona Memorial is built over the sunken wreckage of the USS Arizona, the final resting place for many of the 1,177 crewmen killed on December 7, 1941 when Japanese Naval Forces bombed Pearl Harbor. The memorial is part of World War II Valor in the Pacific National Monument. The Pearl Harbor Visitor Center includes two museums that tell the story of the attack on Pearl Harbor and World War II. Outdoor exhibits on the visitor center grounds continue the narrative. The USS Arizona Memorial tour includes a National Park Service movie on the attack on Pearl Harbor and the boat ride to the memorial. The Navy placed the first permanent memorial, a ten-foot-tall basalt stone and plaque, over the mid-ship deckhouse on December 7, 1955.