of twenty assigned to temporary duty on board LST-762 at Enewe flak between 27 March and 15 April. They were probably on temporary duty fdr YAG decontamination. Task Unit 7.3.5 (Utility Unit) The Utility Unit consisted of two salvage lifting vessels, [the USS Gypsy and the USS Mender, and five fleet tugs, USS Apache, USS Molala, USS Sioux, and USS Tawakoni. Kocopa, USS The Mender replaced the Gypsy on 25 March 1954, when the Gypsy left for Pearl Harbor. Tables 7@ through 76 summarize each ship's activity on a shot-by-shot basis. The basic assignment of the Utility Unit was to provide harpor and towing services to the joint task force. The unit also gave exkensive support to a number of scientific projects. The Sioux and the Planted fallout collection buoys prior to all shots except KOON] for Proj- ect 2.5a and retrieved the buoys after the shots. MBnder, and The Gypsy, all the tugs except the Molala assisted Project 1.4 in a variet but the primary support tug was the Cocopa. During all shots e and NECTAR, the Molala and the Tawakoni assisted Projects 6.4 a prepositioning the YAGs in the predicted fallout area and retri ving them after the shot. All these activities required the Utility Unit ships to opegate in waters that had been contaminated by one or more shots. The Cocoga was with- drawn from support of Project 1.4 after UNION and before YANKEE[because of a buildup of background radiation in the tug from radioactive sjlt retained in her seawater piping; she was replaced in that activity by thd (Reference 45). The sources of the radioactive silt were the n Tawakoni craters formed at Bikini by BRAVO and UNION. A number of ships also were contaminated by fallout from B Gypsy, Cocopa, Apache, and Sioux (Table 21). : the The Gypsy in partibular was most difficult to decontaminate because of corrosion on the decks, which tended to retain fallout. Furthermore, all ships of the Utility 355 Unit