Then Technical Sgt. Bill Gross stands on the flightline Dec. 7, 1991, at Hickam Air Force Base, Hawaii. Sergeant Gross was in Hawaii to help commemorate the 50-year anniversary of the bombing of Pearl Harbor. Sergeant Gross was a long-time crew chief assigned to the Air Force's first KC-10 and has been stationed with the aircraft for nearly his entire career. As the KC-10 celebrates its 30th year of Air Force service on March 17, 2011, Sergeant Gross can claim that he has been there every step of the way. (U.S. Air Force photo)