Io. 1 as its purpose the constitution of authority for Air Force commands to begin initial planning for HARDTACK, was prepared by the 4950th Test Group (Nuclear) early in March 1957 and forwarded through channels to Headquarters United States Air Force on 29 April 1957. 18 The nessage stated that the tentative starting date of HARDTACK was 1 May 1958, and that approximately 30 devices would be tested. Also, The United States Air Force will be the executive agent for the test series and Air Force ,articipation will follow the general pattern established during previous oversecs nuclear tests, ARDC will man, train, and or~ ganize Air Task Group 7.4. The Air Task Group will consist of three units, (1) a Test Base Unit provided by ARDC, (2) a Test Aircraft Unit provided by major USAF - Commands and (3) a Test Support Unit fest Services Unit/ provided by MATS. The mission and function of Task Group 7.4 and subordinate units will parallel those assigned for Operation REDWING, A draft of the final book message more extensive and detailed than the preliminary book message, was prepared and forwarded in August 1957 to Special Weapons Center for submission to Headouarters United States Air Force. tember 1957. The final book message had not been issued et the end of Sep— This final message, although known to be undergoing con- siderable revision at Headquarters United States Air Force was intended to outline the organizational structure of Task Group 7.4 for HARDTACK and todelineate broadly the responsibilities of Air Force “jor Com mands in providing versonnel :nd resources to the Commander, Task Group Tehe AFWL/ HQ , > bigii

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