After study of the T/D in the Task Force Headquarters and after receipt of reports made by a manpower survey team during late Spring, 1953, a firm Army Task Group T/D was brought into being by midsummer. On Department of the Army (D/A) authority in July, the 516th Military Police (MP) Service Company, the 511th Transportation Company, and the 4th Transportation Truck Company, were inactivated by Task Force orders and their personnel spaces were absorbed into the 7126th AU bulk allotment. Because of the approaching CASTLE build-up phase, the full authorized strength T/D was activated at that time so as to absorb with greater facility the spaces being transferred. At the same time, further studies of a T/D best suited to interim period needs were continued. This important organizational change in the Army Task Group consolidated all Task Group elements into one administra- tive unit, the 7126th AU, and greatly facilitated the manner in which Army participation in overseas atomic tests would be subsequently administered. With the successful completion of both Operations GREENHOUSE and IVY, the position of the AEC participants within the Task Force organization had become a matter for review and con- sideration. Once again, the general acceleration which had oc- curred in the overall AEC program had made itself felt by enlarg- ing the scope of SFOO operations and by greatly increasing the ' AEC investment in base facilities at Eniwetok. Until Operation CASTLE, direct AEC-SFOO participation in tests had occurred within 18