On July 17, 1962, he flew the X-15 to an altitude above 50 miles, thereby qualifying as an astronaut according to the United States definition of the boundary of space.
White was designated the Air Force's primary pilot for the North American X-15 program in 1958. While the new plane was undergoing its initial tests, he attended the Air Command and Staff College at Maxwell Air Force Base, Alabama, graduating in 1959. He made his first test flight of the X-15 on April 15, 1960, when the aircraft was fitted with two interim, 16,000 lbf (71 kN) XLR-11 thrust rocket engines. Four months later, he flew to an altitude of 136,000 feet (41.5 km) above Rogers Dry Lake. White would have participated in the Air Force's Man In Space Soonest program, had it come to fruition.
In February 1961, White unofficially set a new air speed record when he flew the X-15 at a speed of 2,275 mph (3,661 km/h), following the installation of a 57,000 lbf (250 kN) thrust XLR-99 engine. White was the first human to fly an aircraft at Mach 4 and later Mach 5 over the next eight months. On November 9, 1961, White flew the X-15 at 4,093 mph (6,587 km/h), making him the first pilot to fly a winged craft at six times the speed of sound (Mach 6). PresidentJohn F. Kennedy used the occasion to confer the most prestigious award in American aviation, the Robert J. Collier Trophy, jointly to White and three of his fellow X-15 pilots: NASA's Joseph A. Walker, CommanderForrest S. Petersen of the U.S. Navy, and North American Aviation test pilot Scott Crossfield. A day later, Air Force Chief of Staff General Curtis E. LeMay awarded White his new rating as a Command Pilot Astronaut.
On July 17, 1962, Major White flew the X-15 to an altitude of 314,750 feet (59 miles, 96 km). This qualified him for USAF astronaut wings, becoming the first "winged" astronaut, and one of a few who have flown into space without a conventional spacecraft. Major Bob White was featured with a cover story in the August 3, 1962, issue of Life magazine, detailing his July 17 flight.
Pilot Robert White commented on his high altitude X-15 flights:
My flights to 217,000 feet [66 km] and 314,750 feet [96 km] were very dramatic in revealing the Earth's curvature ... at my highest altitude I could turn my head through a 180-degree arc and wow!—the Earth is really round. At my peak altitude I was roughly over the Arizona/California border in the area of Las Vegas, and this was how I described it: Looking to my left I felt I could spit into the Gulf of California; looking to my right I felt I could toss a dime into San Francisco Bay.
White returned to the United States and Wright-Patterson Air Force Base in June 1968, where he served as director of the F-15 Eagle Systems Program, responsible for managing development and production planning, in the Aeronautical Systems Division, Air Force Systems Command.
On July 31, 1970, White assumed duties as commander of the Air Force Flight Test Center, Edwards Air Force Base, where he was responsible for research and developmental flight testing of manned and unmanned aerospace vehicles, aircraft systems, deceleration devices and for the Air Force Test Pilot School. During his tenure, testing was begun on such important programs as the F-15 Air Superiority Fighter, the A-X ground attack aircraft, and the Airborne Warning and Control System. In October 1971, he completed the Naval Test Parachutist course and was awarded parachutist's wings.
He served at the Flight Test Center until October 17, 1972. The following month, he assumed the duties of Commandant, Air Force Reserve Officer Training Corps (AFROTC), responsible for the entire AFROTC officer accession program at all colleges and universities across the United States.
1961 Collier Trophy, for invaluable technological contributions to the advancement of flight, and for great skill and courage as test pilots for the X-15.[7]
The President of the United States of America, authorized by Title 10, Section 8742, United States Code, awards the Air Force Cross to Colonel Robert M. White, for extraordinary heroism in military operations against an opposing armed force as an F-105 Mission Commander near Hanoi, North Vietnam, on 11 August 1967. On that date, Colonel White led the entire combat force against a key railroad and highway bridge in the vicinity of Hanoi. In spite of 14 surface-to-air missile launches, MIG interceptor attacks, and intense antiaircraft artillery fire, he gallantly led the attack. By being the first aircraft to dive through the dark clouds of bursting flak, Colonel White set an example that inspired the remaining attacking force to destroy the bridge without a single aircraft being lost to the hostile gunners. Through his extraordinary heroism, superb airmanship, and aggressiveness in the face of hostile forces, Colonel White reflected the highest credit upon himself and the United States Air Force.