Dwayne Allen Day is an American space historian and policy analyst and served as an investigator for the Columbia Accident Investigation Board. Day is a senior program officer for the Aeronautics and Space Engineering Board of the National Research Council/National Academy of Sciences, where he has served as a study director on studies concerning NASA's aeronautics flight research capabilities, the planetary exploration program, the size of the astronaut corps, the threat of asteroids striking Earth, NASA workforce skills, radiation hazards to astronauts on long duration spaceflights, U.S. Air Force astrodynamics standards, and other projects. He previously served as a program officer on the Space Studies Board. He has also written extensively on the history of American satellite reconnais