Deferred DTG: 12/21162 Oct 1957 . Book Message Froms Chief of Steff, United States Air Force Tos Commander, Task Group 7.4 Cites 51415 Froms 4AFOOP Commander, Air Force Special Weapons Center 1, On 24 September 1957, the Joint Chiefs of Staff approved Department of Defense participation in Operation HARDTAOK, a series of atomic tests at the Eniwetok Proving Grounds beginning about 1 April 1958 and ending approxi- mately 15 July 1958 The Chief of Staff, as Executive Agent has issued the necessary directive to Commander, Joint Task Force SEVEN for conducting the operation. To support this operation, Headquarters USAF hereby directs organization of Task Group 7.4, at earliest practicable date. Task Group 7.4 will be composed generally of units and elements as listed below. The Commander, Task Croup 7.4 is authorised to organise these units and elements as may be required by operational necessity. 2. Idst of unite and elomentss ee Headquarters Task Group 7.4 (Provisional), be ce Test Base Unit with the following elements: (1) 4 support squadron. (2) Helioopter element. Test Aircraft Unit with the following elements: (1) Cloud Sampling Element (augmented hy 6 SAC B-57D aircraft). (2) Air Force Effects Elements (includes IBDA, VHA/UHA, Tone~ (3) Navy Effects Element (to be provided by NASWF, Kirtland AFB, sphere elements), New Mexico, and attached to the Test Aircraft Unit for Operational control), supply). Test Services Unit with the following elements: (1) Search and Rescue Element (to include veather island re- (2) Weather Reporting and Forecasting Element. (3) Weather Reconnaissance Flement, AFWL/ HQ INCLOSURE 34 wD de f 7}4 AGE /

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