taskGroup 7.4 helicopters also provided support at Bikini during the build-up phase until relieved by a Marine helicopter squadron in late January 1958. To coordinate all airlift requirements, the Test Base Unit operated the Eniwetok Airlift Operation Office. This element was manned by civ- ilians furnished by Task Group 7.5 and military personnel of Task Group 7.4. This element coordinated transportation requirements with the Trans- portation Coordinating Agent of each Task Group, and allocated space available on the various scheduled and special airlift flights. They also operated FRED Control, which was responsible for flight following and coordination of liaison and helicopter flights among the islands of Eniwetok Atoll. The C-54 aircraft flew regularly scheduled missions between Eniwetok and Bikini and between En’wetok and outlying sites. During the operational phase of HARDTACK, and before the cessation of activity at Bikini at least two scheduled flights a day were made between Eniwetok and Bikini, except that at the height of the build-up, three (3) flights per day were required. Weekly flights were made to Naurw and Tarawa, while monthly flights were made to Truk, Guam, Kwajalein, Majuro, Wake, and Midway Islands. Many additional flights were made to all of these sites and to other places when special requirements existed. When technical complications required that the TEAK and ORANGE shots be moved from their planned site at Bikini to Johnston Island, weekly flights betiveen Eniwetok and Johnston Island were instituted. As this operation neared D-Day, the tempo of these flights were stepped up, and a shuttle between Johnston Island and Honolulu became necessary. From the beginning of the operational phase of HARDTACK in March 1958 until 100 et AFWU nO TY a ft cn fie