X-15A-2 with full scale ablative and external tanks installed parked in front of hangar. August 4, 1…

X-15A-2 is rolled out of the paint shop after having the full scale ablative applied at NASA Dryden …

The second X-15 rocket plane (56-6671) is shown with two external fuel tanks which were added during…

X-15 with pilots and crew, in Cockpit, Edward "Ed" Nice,  on Ladder, Thomas "Tom" McAlister,  Bac…

X-15 personnel commemorating all three X-15's being flown during the same week. February 7, 1961 Ba…

X-15 #2 (56-6671) launches away from the B-52 mothership with its rocket engine ignited. The white p…

North American Aviation X-15 followed by a Lockheed F-104A Starfighter chase plane, the North Americ…

As crew members secure the X-15 rocket-powered aircraft after a research flight, the B-52 mothership…

 This photo shows the X-15A-2 (56-6671) on a research flight with a ramjet engine attached to the b…

A series of ground and in-flight accidents occurred during the X-15's contractor program, fortunatel…

On 9 November 1962, an engine failure forced Jack McKay, a NASA research pilot, to make an emergency…

Joe Walker is seen here after a flight in front of the X-15 #2 (56-6671) rocket-powered research air…

Air Force test pilot William J. "Pete" Knight is seen here in front of the X-15A-2 aircraft (56-6671…

NASA test pilots Milton O. Thompson, William H. "Bill" Dana, and John B. "Jack" McKay are seen here …

 The X-15 test pilots clown around in front of the #2 aircraft.From left to right: USAF Capt. Josep…

 NASA X-15 test pilots, left to right; Air Force Captain Joseph H. Engle, Air Force Major Robert A.…

 X-15 test pilots, left to right; Air Force Captain Joseph H. Engle, Air Force Major Robert A. Rush…

 NASA research pilot Bill Dana is seen here next to the X-15 #3 rocket-powered aircraft after a fli…

 NASA research pilot Bill Dana is seen here wearing space suit, next to the X-15 rocket-powered air…

 Captain Joe Engle is seen here next to the X-15-2 (56-6671) rocket-powered research aircraft after…

 NASA research pilot Milt Thompson stands next to the X-15 #3 ship after a research flight. Milton …

 NASA Test pilot Major Robert M. White is seen here next to the X-15 aircraft after a research flig…

 NASA test pilot Neil Armstrong wearing space suit is seen here next to the X-15 ship #1 (56-6670) …

 NASA Dryden test pilot Neil Armstrong is seen here next to the X-15 ship #1 (56-6670) after high s…