ee “ts Baw -~- 10 Mares 1956 yoneonaaeatFOR RECORD tut SUBIECTS Protection of Transient Shipping During Operation CASTLE if “. 1.” In order to provide protection for transient shipping in the region immediately cutside the ENIWETOX/MIKINI Danger Ares during Operation CASTLE plenning factors were established and a plan of action placed in effect as follows: & Planning factors: (1) CASTLE clouds more than 26 hours old should not be hasardous. (2) 2h boar travel of « CASTLE cload should be approxinately 500 nautical miles. b. Plans: (1) The Coumander in Chief, Pacifie Fleet wee requested to make advance diversions of shipping cutside a seetor area from southwest clockwise through north to east to 500 nautical miles frem ground zero from H to H plua 24 hours, (2) Pay Aircraft were planed to sweep the significant forecast secter of cloud travel, using visual and searoh radar methods of sightings out to 800 nautical miles om 0-2 days, out to 600 nautidal miles on Del day and, if necessary, in front of the cloud on D day, P2V aircraft crews were directed to effect diversion on all ships sighted in the sector area on Del and D Day. (3) WB~29 adroraft on routine weather reconnaissance missions were directed to report all sightings of surface shipping encountered. All 73fleets be relayed to the Radar center (CIC USS BATROKO) in the (4) pav aircraft and destroyer security sweeps were directed for the ENIWETOK/BIKINI Danger Area. Infomation from these sweeps was channeled to the Radar center (CIC USS BAIROKO). (5) Information from all the above scurces was channeled into the task force h era for evaluation and consideration at the Weather/Radsafe Coumand Sriefings. INCLOSURE 13 K-69