During the Bikini shots, one ship always provided the carrier, 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 halfway between the atolls, where it served as an aircraft control station. The ship car- ried an Air Force officer from TG 7.4, who acted as an air controller. 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 Plane Unit, also provided postshot support to the sea-phase portion of Project 2.5a, which consisted of assisting in locating fallout collector buoys equipped with radio transmitters. In addition to these planned activities, elements of the Surface Security Unit searched on two occasions for downed RAP Canberra bombers that were incoming to Kwajalein from the Admiralty Islands (the first was lost at sea; the second was forced to land on the beach at Ailinglapalap Atoll), provided interatoll transportation following the temporary closure of the Bikini airstrip after BRAVO, supported weather station activities on Rongerik for UNION and YANKEE, and were scheduled to act as a fallout detection unit and evacuation ship at Ujelang during shot NECTAR if such activities had been required. Aftershot BRAVO, the Philip was heavily contaminated by fallout while serving as plane guard for the Bairoko. Eighty-three of the ship's crew received exposures of more than 3.9 R, with a maximum exposure of 10.5 R recorded. Consequently, the CTG 7.3 recommended that the Philip's entire crew receive a waiver of the MPE, and that the ship be assigned duties unlikely to expose the crew to further contamination. Nevertheless, the ship received additional slight contamination after ROMEO while en route from Enewetak to Bikini on 28 March. The heavy contamination of the atolls to the east of Bikini after BRAVO required evacuation of the Marshall Islander populations, which was done by 347