Brockway McMillan (born March 30, 1915) is a retired American government official and scientist, who served as the eighth Under Secretary of the Air Force and the second Director of the National Reconnaissance Office. McMillan promoted the development of a second generation of reconnaissance satellites: the ARGON satellite mapping system, and LANYARD, the first attempt to acquire higher resolutions imagery. He advocated maintaining the NRO as the primary United States agency in space reconnaissance.