Captain Iven C. Kincheloe Jr.
1950's -- On Sept. 7, 1956, Capt. Iven C. Kincheloe (left) became the first pilot to climb above 100,000 feet as he rocketed to a peak altitude of 126,200 feet. Just 20 days later, making his first flight in the research craft, Capt. Milburn G. "Mel" Apt (in cockpit) became the first person to exceed Mach 3. He was killed moments later when the aircraft broke up as it tumbled violently out of control. Kincheloe was killed in the crash of an F-104 on July 26, 1958. Note where heat and air friction have burned away spots of paint on the X-2's nose.