USS Enterprise (CV-6) was the seventh U.S. Navy vessel to bear the name. Colloquially called "the Big E", she was the sixth aircraft carrier of the United States Navy. A Yorktown-class carrier, she was launched in 1936 and was one of only three American carriers commissioned before World War II to survive the war. She participated in more major actions of the war against Japan than any other United States ship. These actions included the Attack on Pearl Harbor, the Battle of Midway, the Battle of the Eastern Solomons, the Battle of the Santa Cruz Islands, various other air-sea engagements during the Guadalcanal Campaign, the Battle of the Philippine Sea, and the Battle of Leyte Gulf. Enterprise earned 20 battle stars, the most for any U.S. warship in World War II, and was the most decorated U.S. ship of World War II. She is also the first American ship to sink an enemy vessel during the Pacific War when she sank Japanese submarine I-70 on 10 December 1941. On three occasions during the Pacific War, the Japanese announced that she had been sunk in battle, inspiring her nickname "The Grey Ghost".