Considerable difficulty was experienced by the project in placing anchored FFP’s in the array. Although the anchoring system had been succesSfully tested in the Umbrella area several times prior to final placement, only 16 out of 36 anchored FFP’s placed the afternoon of 6 June were Still in position the following morning. The high percentage of failure was probably due to short choppy seas that had blown up the day before in the Umbrella area. The project redesigned and remade 36 new anchored FFP’s, improvising somewhat froin depleted stocks. On the morning of D-1 day, the new anchored FFP’s were placed in the array and remained in position until the shot. After the final test Signal at 1340 on D—-1, the project armed all coracies, using the USS Munsee outside the lagoon and the AVR inside. Al} stations except two were armed and ready by 1800 on D-1. Two of the coracles had pretripped during placement and were therefore removed from their moors, re-armed during the night, and replaced at their stations the morning of D-day. D-day activities were considerably modified from those of Wahoo. Instead of photomosaic mapping, all preshot positions were obtained by M-33 radar on Eniwetok Island, which ranged on a spotting helicopter as it hovered over a given station. Postshot positions were obtained Similarly with Mark 25 fire-control radar aboard the USS Boxer (LPH-4) ranging on the Marine helicopters performing FFP recovery. Also, because of the possibility that a large number of coracies would break their moors and drift onto the reef, the project had two recovery teams Standing by during the shot; each team consisted of one LCU with a crane aboard, one LCM, and one DUKW with A-frame carried aboard the LCU. All project recovery was coordinated by Task Group 7.3 from the CIC aboard the USS Boxer. At H-2 hours, 14 FFP’s were dropped by the Task Group 7.4 helicopter outside the lagoon along previously planned drop lines (Section A.5). ery operation moved aboard the Boxer. At H~1 hour, project control of the recov- The two lagoon recovery teams, the AVR, and the USS Munsee with another LCM remained near the Boxer during the shot. At H+30 minutes, two Marine helicopters departed the Boxer to recover the free-floating FFP’s outside the lagoon; meanwhile, a second drop of self-anchoring FFP’s was made inside the lagoon from an SA-16. Also, two FS’s were recovered from the target array by the Task Group 7.4 helicopter and returned to Parry Island for Cl™ analysis and beta-gamma decay measurements. , Recovery of the free-floating FFP’s outside the lagoon proceeded rapidly and was completed at H+1'4 hours. The two Marine helicopters then moved inside the lagoon and continued FFP recovery. Between H+1 and H+ 1% hours, project crews performed early recovery of samples from the DD-474, DD-592, and DD-593, all samples being processed through the SRC. All ship Samples, together with aliquots of all sample solutions used in early chemistry, were placed aboard the H+6 hour flyaway. Also at about H+ uy hours, the two Special recovery teams and the AVR moved into the array to check for drifting coracles and assist in FFP recovery. No coracles had broken loose from their moors; however, seven had been overturned by the detonation. At H+ 3% hours, recovery of the coracles began with the USS Munsee operating outside the lagoon, one LCU and LCM team in the north section of the array, and the second LCU and LCM team in the south section. The AVR and the two Marine helicopters continued FFP search and recovery, completing this operation at about H+5 hours. By H+7 hours all coracles except the two reef stations had been recovered, and 63 FFP’s had been retrieved. (Task Group 7.3’s efficient and effective recovery unquestionably increased the value of the data obtained on Shot Umbrella and is greatly appreciated by the project.) Coracles were returned to the BWA, where pulling and counting of IC trays started immediately and continued throughout the night. On D+1 day, the USS Munsee, assisted by an LCM, recovered the two coracles on the atoll reef and completely cleared the entire Umbrella array of remaining mooring components. Also on that morning, the project performed a complete recovery and survey of all target ships. Complete stripping of all coracles was started at the BWA, and again all samples were processed through the SRC to assure both proper logging of data and contamination control. By 1430 of that day the IC count on all 24 sets of trays had been completed, and the trays were ready for air shipment to NRDL for further analysis. 54 -