U.S. Airmen with the 15th Wing honor guard prepare a U.S. flag for morning colors to begin the Dec. 7 remembrance ceremony at Hickam Field at Joint Base Pearl Harbor-Hickam, Hawaii, Dec. 7, 2013. The 15th Wing sponsored the ceremony. 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.