The Test Aircraft Unit (TAU) gave radsafe briefings for all TG 7.4 aircrews and maintained the specialized radiac equipment installed in its aircraft. The TAU also performed the aerial sample filter installation, removal, and packaging. Training Annex N to JTF 7 Operation Order 3-53 (see Appendix A) specified and directed that two .evels of training -- basic indoctrination and technical -- be required, but allowed each task group to vary the scope of instruction according to the group's operational requirements. Basic indoctri- nation included nontechnical instruction in radiological measures and techniques. Such instruction was to be given to all task force personnel to encourage efficient performance of duties within the allowable exposure levels for radioactive contaminants. Technical training was required of all personnel who staffed the task force radsafe organizations and performed the monitoring and other technical operations, such as decontamination and instrument repair. The technical instruction was to be obtained through existing service courses and at training sessions established at the task group level. Little information has been found on the level of instruction or the content of the basic indoctrination given by the various task groups; the course instituted by the Army (described on p. 92) is probably representa- tive, however. TASK GROUP 7.1. The technical radsafe group depended on obtaining from the AEC and the services both trained personnel and the specialized training the task group required. The sources for technically qualified health physics personnel were the Health Division of Los Alamos Scientific Laboratory (LASL) and special organizations within the Department of Defense (DOD). In the interim between IVY and CASTLE, the Department of the Army authorized the Chief Chemical Officer to establish the lst Radsafe Support Unit (RSSU) with the mission of supporting test operations at both the Nevada and Pacific Proving Grounds. 87 This organization was established