National Reconnaissance Office
Reber served as deputy director of the National Reconnaissance Office from 1 September 1965 to 30 June 1969. He was instrumental in fostering an effective working relationship between the Central Intelligence Agency and Department of Defense in the early days of the National Reconnaissance Office and the National Reconnaissance Program. After his time at the National Reconnaissance Office, Dr. Reber became the chairman of the United States Intelligence Board's Signals Intelligence Committee, retiring from government service in July 1972.