Caribbean basin, replacing an operational capability that had previously been resident at nearby McCoy AFB until that installation's closure in 1975. Detachment 5 was inactivated at Patrick AFB in 1992. Major commands assigned Air Proving Ground Command, 1 October 1949 Air Research and Development Command, 14 May 1951 Redesignated: Air Force Systems Command, 1 April 1961 Air Force Space Command, 1 October 1991–present Major units assigned 2770th Standby Squadron, 20 November 1948 – 1 October 1949 Joint Long Range Proving Ground, 11 May 1949 Redesignated: Florida Missile Test Range, 30 June 1951 Redesignated: Atlantic Missile Range, 1 July 1958 Redesignated: Air Force Eastern Test Range, 1 July 1964 Redesignated: Eastern Range, 12 November 1991–present Advance HQ, Joint Long Range Proving Ground, 1 October 1949 – 15 August 1950 Redesignated, 4820th Air Base Squadron, 15 August 1950 – 4 September 1951 Air Force Eastern Test Range, 1 October 1949 – 1 February 1977 Det. 1 Space and Missile Test Center (SAMTEC), 1 February 1977 – 1 October 1979 Eastern Space & Missile Center (ESMC), 1 October 1979 – 1 November 1991 4800th Guided Missiles Wing, 3 December 1950 Redesignated: 6555th Guided Missile Wing, 14 May 1951 Redesignated: 6555th Guided Missile Group, 1 March 1953 – 7 September 1954 2d Mobile Communications Group, 1 October 1975 Redesignated: 2nd Combat Communications Group, 24 March 1976 – 30 June 1990 4802d (later 6555th) Guided Missile Squadron, 10 April 1951 – 15 August 1959 Inactivated and reactivated as: 6555th Guided Missile Group, 15 August 1959 Redesignated: 6555th Test Wing, 21 December 1959 Redesignated: 6555th Aerospace Test Wing, 25 October 1961 Redesignated: 6555th Aerospace Test Group, 1 April 1970 – 1 October 1990 4800th Guided Missiles Wing, 3 December 1950 Redesignated: 6555th Guided Missile Wing, 14 May 1951 Redesignated: 6555th Guided Missile Group, 1 March 1953 – 7 September 1954 550th Guided Missiles Wing, 11–29 December 1950 4802d (later 6555th) Guided Missile Squadron, 10 April 1951 – 15 August 1959 Inactivated and reactivated as: 6555th Guided Missile Group, 15 August 1959 Redesignated: 6555th Test Wing, 21 December 1959 Redesignated: 6555th Aerospace Test Wing, 25 October 1961 Redesignated: 6555th Aerospace Test Group, 1 April 1970 – 1 October 1990 6550th Air Base Wing, 4 September 1951 – 1 March 1953 Redesignated: 6550th Air Base Group, 1 March 1953 – 1 October 1990 Redesignated: 1040th Space Support Group, 1 October 1990 – 12 November 1991 Redesignated: 45th Support