U.S. Sailors assigned to the amphibious dock landing ship USS Pearl Harbor (LSD 52) salute an American flag during a Pearl Harbor remembrance ceremony Dec. 6, 2013, at Naval Base San Diego. The morning of Dec. 7, 1941, Japanese bombers staged a surprise attack on U.S. military forces in Hawaii. The day after the attack, before a joint session of Congress, President Franklin D. Roosevelt asked for a declaration of war against Japan and the U.S. officially entered World War II.