4735th Air Defense Group

The 4735th Air Defense Group was a United States Air Force organization created during the Cold War to provide a unified headquarters and support structure for fighter-interceptor forces stationed at Otis Air Force Base in Massachusetts. It operated under the Boston Air Defense Sector of Air Defense Command and was responsible for coordinating the 58th Fighter-Interceptor Squadron, the 60th Fighter-Interceptor Squadron, and, for part of its existence, the 602nd Consolidated Aircraft Maintenance Squadron. The group was organized on 18 August 1957 after the inactivation of the 33rd Fighter Wing and related organizations at Otis. Its creation separated the operational command of the fighter squadrons from the installation-host responsibilities that were transferred to elements of the 551st Airborne Early Warning and Control Wing. In this arrangement, the 4735th served as the principal group-level command for the two interceptor squadrons inherited from the former 33rd Fighter Group (Air Defense). The 58th Fighter-Interceptor Squadron initially operated Northrop F-89 Scorpion aircraft, including F-89H and F-89J variants. These aircraft could employ air-to-air rockets and, in the case of the F-89J, the nuclear-capable AIR-2 Genie rocket. The 60th Fighter-Interceptor Squadron flew Lockheed F-94C Starfire aircraft armed with Mighty Mouse rockets. Both squadrons used data-link equipment that allowed their aircraft to receive interception instructions through the Semi-Automatic Ground Environment system, reflecting the increasingly networked character of North American air defense during the period. The group also supported an important aircraft transition. In February 1959, the 60th Fighter-Interceptor Squadron converted to the McDonnell F-101B Voodoo. It became the first Air Defense Command squadron to operate the F-101, a supersonic interceptor designed for rapid response against potential bomber threats. The transition made Otis an early operational location for a major modernization of the command's interceptor fleet. The 4735th's existence ended when the 58th Fighter-Interceptor Squadron moved to Walker Air Force Base, New Mexico, on 1 August 1959. With only one operational fighter squadron remaining at Otis, the group was discontinued. The 60th Fighter-Interceptor Squadron was reassigned directly to the Boston Air Defense Sector, while the 602nd Consolidated Aircraft Maintenance Squadron was inactivated. The organization therefore had a brief but significant role in the reorganization and modernization of United States air defense forces in the late 1950s. It was a military unit rather than a commercial brand, with no independent consumer products, commercial ownership, or public-market identity.

The 4735th Air Defense Group was organized at Otis Air Force Base, Massachusetts, on 18 August 1957. Its establishment followed the inactivation of the 33rd Fighter Wing and associated organizations. The new group assumed responsibility for the operational fighter units formerly connected with the 33rd Fighter Group (Air Defense), while the installation-host role at Otis passed to elements of the 551st Airborne Early Warning and Control Wing. The group's principal operational components were the 58th Fighter-Interceptor Squadron and the 60th Fighter-Interceptor Squadron. The 58th operated Northrop F-89H and F-89J Scorpions. The F-89H carried AIM-4 Falcon missiles and unguided Mighty Mouse rockets, while the F-89J could carry the nuclear-capable AIR-2 Genie rocket. The 60th operated Lockheed F-94C Starfires equipped for rocket-armed interception. Both squadrons were integrated into the Semi-Automatic Ground Environment, whose data-link network enabled ground controllers to direct interceptor aircraft toward airborne targets. A maintenance organization, the 602nd Consolidated Aircraft Maintenance Squadron, was activated at Otis and assigned to the group to support the aircraft of both fighter squadrons. The arrangement gave the 4735th responsibility for a compact but important air-defense force covering eastern Massachusetts within the Boston Air Defense Sector. The group's most notable modernization event occurred in February 1959, when the 60th Fighter-Interceptor Squadron transitioned to the McDonnell F-101B Voodoo. The squadron became the first Air Defense Command unit to fly the F-101, a supersonic interceptor that represented a major advance over the older subsonic F-89 and F-94 fleets. The conversion took place shortly before the group was dissolved. On 1 August 1959, the 58th Fighter-Interceptor Squadron relocated to Walker Air Force Base, New Mexico. Because only the 60th remained at Otis, the 4735th Air Defense Group was discontinued. The 60th was transferred directly to the Boston Air Defense Sector, and the 602nd Consolidated Aircraft Maintenance Squadron was inactivated. The group consequently existed for less than two years, but its history illustrates the United States Air Force's postwar shift toward specialized command structures, centralized ground-controlled interception, nuclear-capable interceptor weapons, and supersonic aircraft.

• 1959

  First Air Defense Command F-101B squadron

  [1]4735th Air Defense Groupen.wikipedia.org

  In February 1959, the 60th Fighter-Interceptor Squadron converted to the McDonnell F-101B Voodoo and became the first Air Defense Command squadron to operate that aircraft.

• 1959

  Discontinuation

  [1]4735th Air Defense Groupen.wikipedia.org

  The group was discontinued on 1 August 1959 after the 58th Fighter-Interceptor Squadron moved to Walker Air Force Base.

• 1958

  Command of Colonel David B. Tudor

  [1]4735th Air Defense Groupen.wikipedia.org

  Colonel David B. Tudor is recorded as commanding the group in 1958.

• 1957

  Organization at Otis Air Force Base

  [1]4735th Air Defense Groupen.wikipedia.org

  The 4735th Air Defense Group was organized on 18 August 1957 at Otis Air Force Base, Massachusetts, under the Boston Air Defense Sector.

• 1957

  Assumption of fighter-interceptor command

  [1]4735th Air Defense Groupen.wikipedia.org

  The group took command of the 58th and 60th Fighter-Interceptor Squadrons after the inactivation of the 33rd Fighter Wing and related organizations.

A Cold War United States Air Force command and support organization for fighter-interceptor operations and aircraft maintenance at Otis Air Force Base.

• Interceptor aircraft · 1957

  Northrop F-89H Scorpion

  The F-89H was one of the interceptor variants operated by the 58th Fighter-Interceptor Squadron. Its weapons included AIM-4 Falcon missiles and Mighty Mouse rockets, and the aircraft was integrated with the ground-controlled interception network used by Air Defense Command.

• Interceptor aircraft · 1957

  Northrop F-89J Scorpion

  The F-89J served with the 58th Fighter-Interceptor Squadron at Otis. This version could carry the AIR-2 Genie, a nuclear-capable air-to-air rocket developed for use against formations of enemy bombers.

• Interceptor aircraft · 1957

  Lockheed F-94C Starfire

  The 60th Fighter-Interceptor Squadron operated the F-94C Starfire during the group's early period. The aircraft used Mighty Mouse rockets and received interception direction through the Semi-Automatic Ground Environment system.

• Supersonic interceptor aircraft · 1959

  McDonnell F-101B Voodoo

  The F-101B Voodoo replaced the 60th Fighter-Interceptor Squadron's F-94Cs in February 1959. The conversion made the squadron the first in Air Defense Command to operate the F-101 and marked a transition toward faster, more capable interceptor aircraft.

• 1959

  Conversion of the 60th Fighter-Interceptor Squadron to the F-101BGeneration change

  Background

  Air Defense Command was modernizing its interceptor force with faster aircraft capable of responding to Cold War bomber threats.

  Action taken

  The 60th Fighter-Interceptor Squadron replaced its F-94C Starfires with McDonnell F-101B Voodoos in February 1959.

  Aftermath

  The squadron became the first Air Defense Command unit to fly the F-101, although the parent group was discontinued later that year.

  Source

• 1959

  Discontinuation after the 58th Squadron relocationStrategy

  Background

  The 58th Fighter-Interceptor Squadron moved to Walker Air Force Base, leaving only one operational fighter squadron at Otis.

  Action taken

  The Air Force discontinued the 4735th Air Defense Group on 1 August 1959, reassigned the 60th directly to the Boston Air Defense Sector, and inactivated the 602nd Consolidated Aircraft Maintenance Squadron.

  Aftermath

  The group ceased to exist as an organization, while air-defense operations continued at Otis under a direct sector-to-squadron arrangement.

  Source

• 1957

  Creation of a dedicated group headquarters at OtisStrategy

  Background

  The inactivation of the 33rd Fighter Wing required a new command arrangement for the fighter-interceptor squadrons stationed at Otis Air Force Base.

  Action taken

  Air Defense Command organized the 4735th Air Defense Group to coordinate the 58th and 60th Fighter-Interceptor Squadrons and their support functions.

  Aftermath

  The group became the operational headquarters for Otis-based interceptor forces within the Boston Air Defense Sector.

  Source

1. 14735th Air Defense Groupen.wikipedia.org
2. 2A Handbook of Aerospace Defense Organization, 1946–1980apps.dtic.mil