Capt. Mel Apt
Capt. Mel Apt sits in the Bell X-2 rocket-powered aircraft at Rogers Dry Lake, Calif., near Edwards Air Force Base. He reached a speed of Mach 3.2 -- three times the speed of sound -- in the X-2 before it tumbled out of control and he was killed attempting to bail out Sept. 27, 1956. (U.S. Air Force photo)