systems. In 1961 the Electronic Systems Division (ESD) was established at Hanscom Field in order to consolidate the management of the Air Force's electronic systems under one agency. Since that time, the ESD (re-designated the Electronic Systems Center in 1992) has been the host organization on the base. The 3245th Air Base Wing was redesignated as the 3245th Air Base Group on 1 July 1964, remaining responsible to the ESD. While Hanscom's role in system acquisition flourished after the 1950s, its operational mission gradually diminished. As of September 1973, all regular military flying operations at Hanscom ceased. The following year the Air Force terminated its lease of the airfield portion of Hanscom Field, which reverted to state control, but retained the right to use the field. The Air Force re-designated its own acreage surrounding the field as the Laurence G. Hanscom Air Force Base. In 1977 the name was shortened to the present Hanscom Air Force Base. The base saw a second wave of construction during the 1980s. The Electronic Systems Division put up four new systems management engineering facilities (the O'Neill, Brown, Shiely and Bond buildings). For base personnel, there were new service facilities—medical, youth and family support centers—as well as additional housing and a temporary lodging facility. Post Cold War Since July 1992, Hanscom and the Electronic Systems Center (ESC) have been part of the Air Force Materiel Command. In 1994 the Air Force designated ESC as the Air Force Center of Excellence for Command, Control, Communications, Computers and Intelligence (C4I). The 3245th Air Base Group was redesignated the 647th Support Group on 1 October 1992, and then the 647th Air Base Group (647th ABG) on 1 October 1993. The 647th ABG was then inactivated on 1 October 1994, and its mission taken up by the 66th Air Base Wing. The Standard Systems Group at Gunter Annex, Maxwell AFB, Ala.; the 38th Engineering Installation Wing at Tinker AFB, Okla.; the Materiel Systems Group at Wright-Patterson AFB, Ohio; and lastly the Cryptologic Systems Group at Kelly AFB, Texas; were all attached to ESC between 1993 and 1996 in order to consolidate related functions in AFMC under the Center, and to support its expanded mission. Subsequent reorganizations changed the groupings, but all the above organizations (though renamed) except the 38th EIW remained under Hanscom's reporting chain. In 2004, ESC was reorganized into a named wing, group and squadron unit, to