JOSN Oscar Sosa Dover Air Force Base, Del....A color guard takes part in a ceremony honoring the 47 crew members killed in an explosion aboard the battleship USS Iowa (BB-61). The explosion occurred in the No. 2 16-inch gun turret as the Iowa was conducting routine gunnery exercises approximately 300 miles northeast of Puerto Rico on April 19th. OFFICIAL U.S. NAVY PHOTO (RELEASED)