During the Bikini shots, one ship always provided the carri br, Bairoko, with a plane guard; another escorted the Curtiss; and two ships were always assigned to Enewetak to provide security for the atoll. One of these ships sortied from Enewetak on shot day at Bikini to a station halfwa yr between the atolls, where it served as an aircraft control station. Th ship car- ried an Air Force officer from TG 7.4, who acted as an air cont roller. The Renshaw served in this capacity for the first two shots and the Nicholas for the last four. The Surface Security Unit, in conjunction with the Patrol P also provided postshot support to the sea-phase portion of Proj which consisted of assisting in locating fallout collector buoy lane Unit, ct 2.5a, equipped with radio transmitters. In addition to these planned activities, elements of the Su face Security Unit searched on two occasions for downed RAF Canberra b mbers that were incoming to Kwajalein from the Admiralty Islands (the firs was lost at sea; the second was forced to land on the beach at Ailinglapdlap Atoll), provided interatoll transportation following the temporary closfre of the Bikini airstrip after BRAVO, supported weather station activitids on Rongerik for UNION and YANKEE, and were scheduled to act as a falldut detection unit and evacuation ship at Ujelang during shot NECTAR if uch activ- ities had been required. After shot BRAVO, the Philip was heavily contaminated by fa! lout while serving as plane guard for the Bairoko. Eighty-three of the shjp's crew received exposures of more than 3.9 R, with a maximum exposure f 10.5 R recorded. Consequently, the CTG 7.3 recommended that the Phili 's entire crew receive a waiver of the MPE, and that the ship be assigned duties unlikely to expose the crew to further contamination. Neverthele ship received additional slight contamination after ROMEO while from Enewetak to Bikini on 28 March. The heavy contamination of the atolls to the east of Bikini required evacuation of the Marshall Islander populations, which 347