American F-86 Sabre and Lockheed F-94 Starfire. On 1 January 1952 Brown became assistant director of operations of the Fifth Air Force in South Korea. He became Director on 15 July 1952. Brown returned to the United States where he assumed command of the 3525th Pilot Training Wing at Williams Air Force Base, Arizona, on 6 June 1953. He entered the National War College in August 1956. It was the first and only service school he attended after graduating from West Point. After graduation in June 1957, he served as executive to the Chief of Staff of the United States Air Force, General Thomas D. White. Brown was promoted to brigadier general in August 1959. He was selected to be military assistant to the Secretary of Defense, Thomas S. Gates Jr., and then to the new Secretary of Defense, Robert MacNamara, with the rank of major general. Brown became commander of the Eastern Transport Air Force at McGuire Air Force Base, New Jersey, in August 1963. In September 1964, he was selected to organize and command Joint Task Force 2, a Joint Chiefs of Staff unit formed at Sandia Base, New Mexico, to the test weapon systems of all the military services in order to avoid wasteful duplication of effort. It was staffed by personnel of all three services. In May 1966 he became the Assistant to the Chairman of the Joint Chiefs of Staff, General Earle G. Wheeler, on the recommendation of his predecessor in the role, Lieutenant General Andrew Goodpaster. Brown was promoted to the same rank on 1 August 1966. The preoccupation of the Joint Chiefs at this time was the Vietnam War, but he was also involved in the handling of the Pueblo crisis. On 1 August 1968, Brown assumed command of the Seventh Air Force and also became deputy commander for air operations, U.S. Military Assistance Command Vietnam (MACV), with the rank of general. As Seventh Air Force commander, he was responsible for all Air Force combat air strike, air support and air defense operations in Southeast Asia. In his MACV position, he advised on all matters pertaining to tactical air support and coordinated the Republic of Vietnam and United States air operations in the MACV area of responsibility. According to Goodpaster, Brown and MACV commander General Creighton Abrams "were like two brothers". General George F. Keegan felt that: Brown's tour of Vietnam ended in