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・ 470th Tactical Fighter Squadron
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・ 471 BC
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・ 4710th Air Defense Wing
・ 4711
・ 4711th Air Defense Wing
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・ 4713th Defense Systems Evaluation Squadron
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4721st Air Defense Group
・ 4722 Agelaos
・ 4722d Air Defense Group
・ 4722d Defense Group
・ 4727th Air Defense Group
・ 4728th Air Defense Group
・ 4729th Air Defense Group
・ 472d Bombardment Group
・ 472d Tactical Electronic Warfare Squadron
・ 472nd Fighter Aviation Regiment
・ 473
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・ 473 Nolli
・ 4730th Air Defense Group
・ 4731st Air Defense Group


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4721st Air Defense Group : ウィキペディア英語版
4721st Air Defense Group

The 4721st Air Defense Group is a discontinued group of the United States Air Force. Its last assignment was with the 4700th Air Defense Wing at Larson Air Force Base, Washington, where it was last active in 1959.
The group was formed to provide a single command and support organization for the two fighter interceptor squadrons of Air Defense Command (ADC), that were tenants at Larson, a Tactical Air Command (TAC) base. It was discontinued after the 322d Fighter-Interceptor Squadron moved in 1959, leaving only a single fighter squadron at Larson.
==History==
The 4721st Air Defense Group was organized in December 1956 at Larson Air Force Base, Washington〔Cornett & Johnson, p. 89〕 to centralize supervision and support of the 322d Fighter-Interceptor Squadron (FIS) and the 538th FIS. Both squadrons were already stationed at Larson, flying radar equipped and HVAR rocket armed North American F-86D Sabre interceptor aircraft,〔Cornett & Johnson, p. 125〕〔Cornett & Johnson, p. 130〕 and assigned directly to the 9th Air Division.〔Maurer, p. 396〕〔Maurer, p.645〕 The 4721st was a tenant of Tactical Air Command (TAC)'s 62d Air Base Group (ABG), the host organization at Larson.
In July 1957, the base transferred from TAC to Military Air Transport Service, although the 62d ABG remained the host unit.〔Ravenstein, p. 99〕 In the summer of 1957, both the 322d FIS and the 538th FIS upgraded to later model Sabres equipped with data link to tie them directly into the Semi-Automatic Ground Environment command and control system.〔〔 About June 1958, the 538th FIS converted to Lockheed F-104 Starfighters, armed with the M61 Vulcan 20mm rotary cannon and AIM-9 Sidewinder missiles.〔
In April 1959, the 322nd FIS moved to Kingsley Field, Oregon and was reassigned out of the group as part of ADC's drawdown at Larson.〔 The following month, the 4721st was discontinued〔 and its remaining squadron, the 538th FIS, was assigned directly to the 4700th Air Defense Wing.〔

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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