The Bangor Air Defense Sector is an inactive United States Air Force organization. Its last assignment was with 26th Air Division at Topsham Air Force Station, Maine, where it was inactivated on 1 April 1966. From 1958 through 1966, the sector controlled air defense fighter, missile and radar units in Maine and northern Vermont and New Hampshire. From 1958 to 1960, it also controlled a radar unit in Canada.
The Bangor Air Defense Sector was organized in January 1957 at Topsham Air Force Station, Maine and assigned to the 32nd Air Division, located at Syracuse Air Force Station, New York. However, it was not initially assigned any operational units.
On 15 August 1958, the 32nd Air Division was inactivated and replaced by the 26th Air Division, and the sector was reassigned to the 26th. At the same time, the sector assumed command of air defense units in its area of responsibility that had been assigned directly to 32nd Air Division. These units provided air defense of Maine and most of Vermont and New Hampshire, as well as small parts of New York and Nova Scotia. The fighter squadrons assigned to its 14th and 23rd Fighter Groups flew Convair F-102 Delta Daggers and McDonnell F-101 Voodoos. The active duty fighter units were augmented by Air National Guard units of the 101st Air Defense Wing located at Dow Air Force Base, Maine; Grenier Field, New Hampshire, and Ethan Allen Air Force Base, Vermont. These squadrons operated the Northrop F-89 Scorpion and North American F-86 Sabre, with one squadron later upgrading to the F-102.
On 1 March 1959 the sector's new Semi Automatic Ground Environment (SAGE) direction center (DC-05) became operational. DC-05 was equipped with dual AN/FSQ-7 Computers. As the sector's aircraft control and warning squadrons entered the SAGE system that year, their controllers were centralized in the sector direction center and the squadrons were redesignated radar squadrons. The sector's 672d Aircraft Control and Warning Squadron at Barrington Air Station in Canada did not convert, but was transferred to Boston Air Defense Sector the following year. In addition to its assigned units, the sector's direction center also controlled Army air defense systems, interfacing with the Army's AN/FSG-1 Missile Master control system.
The sector added a surface to air missile unit in June 1959, when the 30th Air Defense Missile Squadron was activated at Dow Air Force Base, Maine, although the squadron would not be operational until the following year. The following month, the 23rd Fighter Group was inactivated when Presque Isle Air Force Base, Maine was transferred from Air Defense Command (ADC) to Strategic Air Command. However, its 75th Fighter-Interceptor Squadron moved to Dow, and was assigned directly to the sector. In October, the 27th Fighter-Interceptor Squadron moved to Loring Air Force Base, Maine from Griffiss Air Force Base, New York and was assigned to the sector. Once it arrived at Loring, it began converting to the Convair F-106 Delta Dart.
In 1962, ADC adjusted the sector area of responsibility, which resulted in the transfer of the 654th, 764th, 765th and 911th Radar Squadrons to the Boston Air Defense Sector. This reduced the sector's area of responsibility in the United States to only a portion of Maine. Although the sector remained assigned to the 26th Air Division, it was operationally controlled through the Northern NORAD Region in Canada.
In 1964, the Air Force phased the Boeing CIM-10A BOMARC out of the air defense system. As a result, the 30th Air Defense Missile Squadron was inactivated on 15 December.
The sector was inactivated 1 April 1966 as part of an ADC reorganization, with its mission, personnel and equipment being reassigned to the 36th Air Division, which was simultaneously activated at Topsham.