—-~ -+ ae - -@-g-——-- -4— zero points to coordirats the activities of the various projects in these congs tlt ares; ani assigned tent, trailer, and laboratory space as required. J-6 was composed of 10 men representing the DOD, UCRL (Livermore), and LASL, «ich the LASL group serving as the final clearing house for all three agencies in transmuittieg the requirements of TG 7.1 to TG 7.5. During the planning phase the four UCRL representatives functioned from their own leburatery, whereas the DOD representative established residence at Los Alamos. During the irstruricataticn and shot periods thes: three grouus combined in the Forward Area, and reprzscatztives of this combined group were ststioned at the various sites throughout the PPG where major activities concentrated. Under this method of operution in the field, individual members of the group were not restricted to problems of their parent agency and frequently assisted other agencies in accomplishing the over-all mission of the Task Group. During the period from October 1952 to May 1953, devices cr weapons and ensrinie.ts were adicd or deleted from the operation with a frequcncy that procuced a ecitinucl revision of the test facilities required by the resultirg scientific progran.s. However, at the end of May 1953, it was estimated that the basic criteria necessaryfor the design of 95 per cent of the scientific structures had been transmitted to the AEC Field Manager, Eniwetuk Field Offic: The techriique employed during this period was te delineate items which would be required in the operation regardless of the concept of ths day. This included items such as the Parry as. sembly area, the Bikini subinerirne cable sys:em, modifications to the Parry eryogenic piarts, and the basic major scientific stetions. This approach was necessary because the time in- volved in design, procurement, and construction precluded waiting until the concept was firm and locations were selected before gathering the test-facility criteria. Final zero positions for the six shots then in the program weve selected in June, and the location of all stations with respect to these zero poirts was com r'isted and published in a preliminary instrument chart. The addition of the seventh shot in A.;.ust did not require add’tional facilities beyond the barge from which it was to be fired. By mid-July construction was suffictently advanced to necessitate opening the J-6 Office in the Forward Area to maintain close coordination with the construction forces. Upon arriva! of the experimenters in January and February of 1954, the major portion of the test facilities were ready for use. The revisions in the shecting sequence and locations resulting from the effects of th: firs: and subsequent shots had little effect upon the facilities required beyond an expansion of the existing capability of firing a barge shot in the Mike crater at Eniwetok Atoll. In the course of the operation approximately 700 scientific stations were constructed, nearly 1500 work orders were prepared, and 21 man-months of machinist time was expeniad in the J-6 Shcp in support of the mission of TG 7.1. 3.7.3 Intra-atoll Airlift Local airlift between the islands of the Bikini and Eniwetok Atolls was required owing to the widely scattered experiments which were conducted during Castle. The operating agency for these airlift services was TG 7.3 at Bikini and TG 7.4 at Eniwetok. an . a Se ee ee Late in 1953 the Bikini intra-atoll airlift was put into operation with a total of seven H-19 helicopters operated by an Air Force detachment. In January regularly scheduled flights originating at Eninman Island proceeded around the atoll in clockwise and counterclockwise directions alternately, stopping at Enyu, Romurikku, and Namu Islands, Ten datly flights were ample to handle the traffic when augmented by special flights until the last week in January, when an increasing atoll population required a total of 12 flights daily to meet the traffic demands. At this time the Marine Corps Helicopter Squardron arrived and assumed the responsibility for the airlift. The Air Force detachment continued to provide a portion of the airlift service in coordination with the Marines until they and their aircraft were phased out to Eniwetok just prior to the first shot. During February the Marine Corps aircraft, although based for maintenance aboard the carrier, were based for operation on the beach at Eninman, where they could be more easily ~~ 41