UCRL shots to Eniwetok to take advantage of ita better weather conditions. To provide a method of compiling detailed requirements, determining project plans, and resolving the conflicting demands of participating diagnostic and effects programs, the Task Group obtained monthly status (progress) reports starting on June 30, 1957, from the 90-odd projects. Following receipt of the first report, the Task Group Commander held a meeting of Project Officers at Sandia Base late tn July. Representatives from the Task Force and the other Task Groups also attended the three day conference and heard each project announce its plan of operation and major problems foreseen at that time. This conference helped to crystallize the over-all program and, with the subsequent written monthly reports, planning progressed on a realistic basis and firm requirements were placed on the Task Force and supporting Task Groups. Determination of Requirements. Information regarding the expected number of personnel to be present in the FA during Operation Hardtack was obtained from the monthly status reports submitted by the various units of the Task Group prior to forward movement. In April, when the decision to move Teak and Orange to Johnston Island was made, Task Units submitted new status reports, which reflected their personnel requirements for that location. This decision radically changed the personnel phasing and peak populations at EPG. The population figures were subdivided by location in the following general categories: sites at Bikini Atoll, sites at Eniwetok Atoll, and ship- board space. Detailed compilations were prepared showing the eatimated weekly population at each location at the EPG. These estimates were useful in determining such things as camp locations, camp size, and over-all camp support required of Holmes and Narver. Population estimates were based on shot schedules, construction schedules, program participation, and organization participation. Changes in any of the above items caused variances between population estimates and the actual operational population. This was particularly true when shots were delayed or fired ahead of schedule. The total number of quarters requested in all camps except Parry and Enyu exceeded the total estimated population by about 10 per cent. The excess was required to permit a few personne! who moved frequently between these locations to have permanent quarters in two camps. Parry and Enyu Islands were considered base camps for their respective atolls, and accordingly, permanent space at these camps was requested for all personnel living temporarily at camps on other islands (except Eniwe- tok Island). As in Operation Redwing, this proved especially beneficial when the temporary camps were no longer habitable, Eniwetok Atoll was considered the base of operations for the entire EPG, and the largest portion of the Task Group personnel was located there. Bikini Atoll and Johnston Island were used as forward working areas for those units participating in shots fired at those locations. A maximum population of 1351 was attained at the EPG on April 24, 1958, when 964 persons were at Eniwetok Atoll and 387 were at Bikini. A total of 2665 individuals participated tn the operation. A chart showing the total personnel present by week is shown in Fig. 3.3. Although the majority of personnel were present at Eniwetok and Bikini Atolls and Johnston Island, a faw of the project personnel of TU-3 and TU-4 were based at Rongelap, Kwajalein, Kusaie, Wotho, and Wake Island. These 70