several operations; and the impact of unscheduled demands would be greatly relieved. In January, 1953, CJTF SEVEN was advised that a permanent cloud sampling unit was being established within the 4925th Test Group (Atomic) at AFSWC in Albuquerque and ultimtely it ws concluded that the best solution to the CASTLE sampling problem was to utilize the IVY F-84G's plus two featherweight B-36 samplers and one RB-36 control aircraft. Another subject taken under discussion and subjected to early planning was that of DOD participation in CASTLE. Because the early information on specific yields and locations of CASTLE devices was limited, DOD participation with a military effects program was first presented in the form of broad objectives. Eight weapons effects programs were under consideration in March, 1953, and included: Program 1. Blast and Shock Measurement. Program 2. Nuclear Effects. Program 3. Structures. Program 4. Biomedical. Program 5. (None). Program 6. Test of Service Equipment and Operations. Program 7. Long Range Detection. Program 8. Thermal Measurements. Program 9. Supporting Measurements. Study and revision of these programs as well as those of LASL and UCRL continued throughout the summer months. Toward the end of June a meeting of all project officers from LASL, DOD, and UCRL was 57