assisted in decontaminating the harbor craft and small boats left behind tee ete in Bikini Lagoon during shots detonated there. A total of 31 personnel of the Utility Unit received exposures greater than 3.9 R during CASTLE. Task Unit 7.3.6 (Atomic Warfare Ship Countermeasures Test Unit) This unit contained two task elements. The Drone Ship Element, 7.3.6.0, was made up of the specially modified Liberty ships, YAG-39 George Eastman) and YAG-40 (USS Granville §. Hall). tamination Element, 7.3.6.1, (USS The Towing and Decon- included the Molala, whose primary responsi- bility was servicing the YAGs, and the Tawakoni, both of them fleet tugs of the Utility Unit. The principal purpose of the unit was to use the YAGS as data-collection platforms for Projects 6.4 and 6.5, which required both ships to be positioned in the area of heaviest fallout. Both YAGs were instrumented with fallout-collection devices, as well as with various test materials, in order to determine their susceptibility to fallout contamination and the ease with which they could be decontaminated. ship had a shielded control compartment and, ated by remote control. Each in addition, could be oper- While YAG-39 mounted a washdown system topside, YAG-40 did not, thereby providing a cortrol situation for the experiments being conducted on board both ships. The YAGs were employed on shots BRAVO, ROMEO, UNION, and YANKEE. Neither ship had a crew on board for the first two shots, but on the latter two YAG-39 carried a skeleton crew that controlled the ship from the shielded control compartment. The usual pattern of operation was for crews to sail both YAGs to Bikini Lagoon prior to the tests. Before the ships left the lagoon, most YAG crewmen were transferred to other TG 7.3 ships for evacuation sorties. Skeleton crews then sailed the YAGs to a debarkation point in the anticipated fallout area accompanied by the Molala. The tug removed the skeleton crews and took over the YAGs by re- mote control. (There is evidence that the Bairoko might also have had remote-control capabilities.) An Enewetak-based P2V-5 aircraft equipped with remote controls assumed control of the YAGs for the duration of shottime activities. The skeleton crew on board YAG-39 could also control 363