specifically charged the Commander with: 1. Technical responsibility for all phases of the Operation. 2. The safety of personnel and units assigned to the JTF. sh 3. Advising the appropriate Commanders under the JCS of the special hazards and danger areas involved in tests and appropriate precautions to insure the safety of units other than the JTF. Acting as agent for the AEC for the exercise of such functions on behalf of the Commission as the latter may deem necessary. On 15 December 1953, the AEC withdrew from the Manager, Santa Fe Operations Office (SFOO) and assigned to the CJTF 7 full authority to act for the Commission in all matters which concerned the successful execution of the Task Force Operation Plan. It should be noted, however, that the CASTLE construction program was about 85% complete at this time. The 15 December date also marked the beginning of the CASTLE operational period which continued until 2 June 1954, at which time all AEC vested authority was relinquished by the CJTF 7. During periods between operations the authority of the CJTF, insofar as AEC functions are concerned, is limited to operational planning and coordination, Organizational and command relations in effect both prior to and during the operational period are depicted on Figure 2 and Figure 3 respectively. 1.4 GENERAL ACTIVITIES OF TASK GROUP 7.5 In off-continent test operations prior to CASTLE, the AEC functions of engineering design, construction, operations and support have been performed by a Task Unit within the organizational structure of the Scientific Task Group. In order that the responsibilities for AEC functions might be more clearly identified and the position of the AEC in the. Task Force organization more postively established, it was recommended that the AEC component of the Task Force be given Task Group status. On 26 February 1953, the Director, Division of Military Application (DMA), AEC, formally requested the CJTF7 to organize the AEC Base Facilities Task Group. In making this request, the DMA accepted certain conditions, among which was the requirement that the CJTF, in accomplishment of his scientific mission, would control and direct the activities of the Scientific and Base Facilities Task Groups through his Scientific Deputy. Task Group 7.5 was formally activated on 4 March 1953. The mission of Task Group 7.5 is to: 1. Provide all base facilities at the Pacific Proving Ground necessary to the Task Force and AEC and its contractors in the conduct of test operations.