Correspondence, diaries, memoranda, reports, family and personal papers, photographs, and other papers documenting Phillips's career in the U.S. Air Force where he specialized in ballistics and weapons research; as director of Project Apollo, the lunar landing program of the U.S. National Aeronautics and Space Administration; and as an executive with TRW, Inc., and other defense contracting firms. Documents his work as commander of the Space and Missile Systems Organization and U.S. Air Force Systems Command. Includes material on atomic weapons tests, Minuteman intercontinental ballistic missile system, Project Saturn (rocket development), Strategic Defense Initiative, Superconducting Super Collider, Titan III launch system, and other defense and aeronautical projects with which he was involved during the Cold War and the space race between the United States and the Soviet Union. Correspondents include Grumman Aircraft Engineering Corporation and North American Aviation, inc.