A study examines from a research of the same solemn day, NASA Armstrong Flight Research Center in California officials remember three pilots in its history who died at the stick of a NASA or National Advisory Committee for Aeronautics (NACA) aircraft.

Howard C. “Tick” Lilly was the first NACA engineering pilot assigned to the Muroc Flight Test Unit, now known as NASA Armstrong. Lilly trained as a Naval aviator and joined the NACA’s Langley Memorial Aeronautical Laboratory in Virginia, now known as Langley Research Center in 1942.

In 1943, he transferred to the NACA’s Lewis Flight Propulsion Laboratory in Cleveland, Ohio, (today's Glenn Research Center) and then to Muroc in 1947. At Muroc he flew the Douglas D-558-1 transonic research aircraft and the Bell X-1. Lilly was the fourth person to exceed the speed of sound.

He died May 3, 1948, when components of the D-558-1’s engine compressor failed, severing control cables and the airplane crashed. He was the first NACA pilot to die in the line of duty. It was 18 years later when the center lost another pilot. Joseph A. “Joe” Walker was a chief research pilot at the NASA Flight Research Center during the mid-1960s.

During World War II Walker flew P-38 aircraft for the Army Air Force in North Africa. He joined the NACA’s Lewis Flight Propulsion Laboratory in Ohio in 1945 (now known as NASA Glenn Research Center) and transferred to the High-Speed Flight Research Station in 1951.

Walker made the first NASA-piloted X-15 flight March 25, 1960, and flew the aircraft 24 times, achieving its highest altitude (354,300 ft.) Aug. 22, 1963; he made the first flight in the Lunar Landing Research Vehicle in 1964 that led to the Lunar Landing Training Vehicle used in Houston to train astronauts to land on the moon. Walker perished June 8, 1966, when his F-104 was caught in the wingtip vortex of the North American XB-70.

In the 1980s, a pilot proficiency flight claimed the life of Richard E. “Dick” Gray. Gray was an aerospace research pilot at NASA's Johnson Space Center in Houston, from 1978 until he transferred to Ames-Dryden Flight Research Center. At JSC he was chief project pilot on the WB-57F high-altitude research aircraft and served as the prime chase pilot in the T-38 aircraft for video documentation of the landing portion of space shuttle orbital flight tests.

Author concludes that a day to reflect on how to keep future astronaut’s safe and the need to remain vigilant on safety. Also declines that a Naval aviator, he flew 48 combat missions in F-4s over Vietnam while assigned to squadron VF-111 aboard the USS Coral Sea in 1972. Gray was fatally injured Nov. 8, 1982, in the crash of a Cessna T-37 aircraft while on a flight to hone his skills flying the airplane.