After the war, King completed interrupted studies at the University of Kansas, from which he graduated with his Bachelor of Science degree in engineering in January 1946.
He accepted a regular Army commission in United States Army Corps of Engineers, and was a group commander at the Aviation Engineers Training School at Fort Francis E. Warren in Wyoming.
He transferred to the United States Air Force when it became a separate service in 1947.

King completed a training course on guided missiles at Fort Bliss, Texas, and was assigned to the newly formed Joint Long Range Proving Ground at Patrick Air Force Base in Florida.
He was involved in the exploration and surveys of the islands where downrange stations were subsequently established as part of the Eastern Test Range at Cape Canaveral, Florida, and for a time was the station commander of the Grand Bahama Auxiliary Air Force Base.

King entered the University of Chicago, which awarded him a Master of Business Administration degree in research and development management in 1954.
He joined the Air Research and Development Command at Wright-Patterson Air Force Base in Ohio in 1955, where he was initially engaged in writing the systems requirements for a medium-range, tactical guided missile.
King read a report from RAND Corporation on reconnaissance satellites, and became convinced that such capabilities would become feasible in the near future.
He was involved in the creation of a space program office at Wright-Patterson which became known as the Advanced Reconnaissance Satellite Program Office.
As its project officer he briefed the Secretary of the Air Force, and convinced him to provide $2 million (equivalent to $14.9 million in 2019) for systems concept studies.
King was a member of the selection committee which chose Lockheed Corporation as the contractor for the WS-117L military satellite program.

In 1957, King became the weapons systems project officer for the SM-62 Snark intercontinental range surface-to-surface cruise missile, and he oversaw its deployment at Presque Isle Air Force Base in Maine.
In July 1959 he joined the Space Systems Division in Los Angeles, where he worked in the project office of the SAMOS reconnaissance  satellite, which became the Office of Special Projects of the National Reconnaissance Office (NRO) in 1961.
He became the Deputy Director, Special Projects in the Office of the Secretary of the Air Force in March 1962, a position he held until September 1966, when he became the commander of the Air Force Satellite Control Facility, the headquarters of the worldwide tracking network, at Los Angeles Air Force Station in Sunnyvale, California.

In August 1967, King became the assistant deputy chief of staff for operations of the Air Force Systems Command at Andrews Air Force Base in Maryland.
He was promoted to brigadier general in 1968, and returned to the West Coast in January 1969 as assistant to the director of the Office of Special Projects, NRO Program A, the component of the NRO responsible for USAF satellites.
He became Program A director in July that year, a post he held until his retirement on 31 March 1971.
After the war, King completed interrupted studies at the University of Kansas, from which he graduated with his Bachelor of Science degree in engineering in January 1946. He accepted a regular Army commission in United States Army Corps of Engineers, and was a group commander at the Aviation Engineers Training School at Fort Francis E. Warren in Wyoming. He transferred to the United States Air Force when it became a separate service in 1947.
King completed a training course on guided missiles at Fort Bliss, Texas, and was assigned to the newly formed Joint Long Range Proving Ground at Patrick Air Force Base in Florida. He was involved in the exploration and surveys of the islands where downrange stations were subsequently established as part of the Eastern Test Range at Cape Canaveral, Florida, and for a time was the station commander of the Grand Bahama Auxiliary Air Force Base.
King entered the University of Chicago, which awarded him a Master of Business Administration degree in research and development management in 1954. He joined the Air Research and Development Command at Wright-Patterson Air Force Base in Ohio in 1955, where he was initially engaged in writing the systems requirements for a medium-range, tactical guided missile. King read a report from RAND Corporation on reconnaissance satellites, and became convinced that such capabilities would become feasible in the near future. He was involved in the creation of a space program office at Wright-Patterson which became known as the Advanced Reconnaissance Satellite Program Office. As its project officer he briefed the Secretary of the Air Force, and convinced him to provide $2 million (equivalent to $14.9 million in 2019) for systems concept studies. King was a member of the selection committee which chose Lockheed Corporation as the contractor for the WS-117L military satellite program.
In 1957, King became the weapons systems project officer for the SM-62 Snark intercontinental range surface-to-surface cruise missile, and he oversaw its deployment at Presque Isle Air Force Base in Maine. In July 1959 he joined the Space Systems Division in Los Angeles, where he worked in the project office of the SAMOS reconnaissance  satellite, which became the Office of Special Projects of the National Reconnaissance Office (NRO) in 1961. He became the Deputy Director, Special Projects in the Office of the Secretary of the Air Force in March 1962, a position he held until September 1966, when he became the commander of the Air Force Satellite Control Facility, the headquarters of the worldwide tracking network, at Los Angeles Air Force Station in Sunnyvale, California.
In August 1967, King became the assistant deputy chief of staff for operations of the Air Force Systems Command at Andrews Air Force Base in Maryland. He was promoted to brigadier general in 1968, and returned to the West Coast in January 1969 as assistant to the director of the Office of Special Projects, NRO Program A, the component of the NRO responsible for USAF satellites. He became Program A director in July that year, a post he held until his retirement on 31 March 1971.
William G. King Jr.