° a Air Task Group personnel visited the manufacturers and Wright Air Development Center (WADC) to study the capabilities of the B-36 featherweight, the B-47, B-57 and B-60, and the Canberra (English version of the B-57). The projected capabilities of the B-57 were the most impres- sive, but that aircraft was not expected to be available for many months to come. However, the possible availability of the B-57 during the lat- ter stages of CASTLE brought about serious consideration of its use. (See pages 17 - 20 for more details on the B-57.) After careful study of the problem, two B~36 featherweights and F-84G's were finally selected as samplers.’ " Colonel Earl W. Keslingrelieved Colonel Gavinas Deputy Commander - of Task Group 7.4 on 26 May 1953. In this capacity Colonel Kesling was acting commander of the Air Task Group and took part in the selection of personnel to man the organization./° In late June 1953, Colonel Kesling notified AFSWC that the Air Task Group would start manning on 15 July 1953. Air Task Group personnel had been selected jointly by the Air Task Group Personnel Section and AFSWC DCS/Personnel.-? ILLUSTRATIONS 4 and 5, opposite, show Task Group 7.4 personnel, authorized versus assigned, and by actual location. During the interim test period the biggest problem faced by the prospective Air Task Group was in the supply field. With the completion of IVY, all Air Force supplies located at Kwajalein for use during nuclear tests had to be moved to the new base at Eniwetok. This task was accom- plished after fifty men expended 45,000 man-hours. The burden included a total of 15,000 measurement tons, more than 37,000 line items, heavy equipment (cranes, tractors, trailers, tugs, trucks and special handling : : APWLHC 20