XS-1 on the ramp with the B-29 mothership in 1949. This is the second XS-1 built; it later was converted into the X-1E. (NASA Photo) Nov. 14, 1949 - NACA's Muroc unit, with about 100 people, designated NACA High-Speed Flight Research Station (HSFRS). Walt Williams was named Chief of the Station.

Mar. 10, 1948 - Herb Hoover was the first NACA pilot and first civilian to fly supersonically in the X-1 .

Nov. 25, 1947 - Howard C. Lilly was first NACA pilot to fly jet-powered D-558-1 Skystreak.

Oct. 14, 1947 - XS-1 exceeded the speed of sound in history's first supersonic flight.

Sept. 7, 1947 - NACA Muroc Flight Test Unit received permanent status from Hugh L. Dryden, NACA's Director of Research. Now numbered 27 people with Walt Williams as Head.

Aug. 20, 1947 - D-558-1 established world speed record of 640.7 miles per hour.

Dec. 9, 1946 - The first successful rocket-powered flight of the X-1 (then designated XS-1), flown by Bell pilot Chalmers Goodlin.

Sept. 30, 1946 - Five NACA engineers, headed by Walt Williams, arrived at Muroc Army Airfield (now Edwards AFB) about this date from Langley Memorial Aeronautical Laboratory, VA, to prepare for X-1 supersonic research flights in joint NACA-Army Air Forces program. First NACA-NASA presence is established at the Mojave Desert site. (Note: Some sources report the arrival of thirteen individuals on Sept. 30, but an early chronology shows only the original 5, with a total of 13 NACA people not present at Muroc until December.)