J-3/903 72923 SUBJECT: - | 30 July 1953 Radiological Hazards in the Warshall Islands Ares During Cperstion C.STLE determine informtion rclative to the forecisting of heavy scconda ry ~ fall-out om the shot site. This will be accomplished by s amll suse ber of WB-29 flights up-wind from the ahet site to a distance of approximtely 600 miles. Sinco the upewind direction will, in general, be toward the populated atolls, minor mdifications in iLreraft tracks should provide sufficient information on conditio.s in thoes xress Also, certain specified aircraft operating in the arca of the test after shot tine will be in peeitions to provide reason=ble indis-tions of actunl cloud movements. In addition, as on Operation IVY, tho Task Force Commander will issue pre-shot foreqaete of cloud trajcetcrit s and fall-out areas and will continues such advisories with post-sno t analyses of the sources of information avallabic. b. Refercnce drinking water sampling 4t distant stelle, ox= isting equipment could, on a limited tasis, be diverted to such a poste shot effort in the event cogent and compelling rensons arcese requir ing sach setion. Past experience indicates, howevor, that such sc tioa is necessary caly under extrome conditions. @. Reference evacuation of native popul_tions, no task force equipment will be aveilable for meh an operation. Consideration of populated isinnds will, however, be onw of the asjor factors in the Commander's decision to shoot, end will be considered in its ralntion to forecast winds and fall-out predictions. 5. Taie command ise sonstantly faced with compromise dotween the necessity for certain efforts and the linitations of forces and squip= ment available to accomplish objectives. Your commonts or suggestions ia ccasona..ce with the above are requestod in order that task force planning may ov realistic and autuslly agreeable to all concerned. FOR tHE CONANDER: - s/Rovert H. Cushing t/ROBERT H. CUSHING Colonel USA netg Chiat of Staff? _———g .