Continued bad weather resulted in repeated postponements of the UNIONtest, ultimately rescheduled for 26 April. Between 17-23 April, TAWAKONI remainedin an anchorage between Bikini and Eneu(see figure 2.1) until 24 April, when it got underway for Enewetak. The ship arrived at Enewetak on 25 April and remained anchoredin the lagoon until Shot UNION was detonated at Bikini on 26 April. During the period 27-29 April, TAWAKONTIassisted USS SIOUX (ATF-75) in laying out buoys in an area north of Enewetak Atoll in support of an overwater fallout collection experiment for Shot NECTAR. TAWAKONJgot underway from Enewetak at approximately 1700 hours on 30 Apmil, enroute to Bikini Atoll, arriving there during the morning of 1 May. During the period 1-4 May, TAWAKONIprovided direct support for Project 1.4 preparations for Shot YANKEE. Transfer of Project 1.4 support to TAWAKONI from COCOPA was necessitated by COCOPA becomingradiologically contaminated during Project 1.4 recovery operations following Shot UNION--see section 3.4. This included laying moors, buoys, and instrument cans in Areas Fox and Dog (see figure 2.1) prior to Shot YANKEE, scheduled for 5 May. At 1600 hours, 4 May, with Project 1.4 preparations for Shot YANKEE complete, TAWAKONI got underwayfor its assigned operating area approximately 60 nmi southeast of surface zero. Shot YANKEEwas detonated at 0610 hours, 5 May. Fallout and contaminated lagoon waterresulting from Shot YANKEEsignificantly increased radiation levels in the Nan anchorage area (Reference 7). As a result, TAWAKONI did notreturn to Bikini until approximately 0800 hours, 6 May; by this time intensity levels in the Nan anchorage had decreased to 7 mR/hr (Reference 8). Between 1803 and 1926 hours, 6 May, and again between 1120 and 1746 hours on 7 May, TAWAKONI joined COCOPA (section 3.4) and MENDER(section 3.5) in washing down LCUs and barges that remainedin the lagoon for the YANKEEdetonation and had received primary fallout from the YANKEEcloud (Reference 3). TAWAKONIremained in or near the Nan anchorage until 1608 hours, 8 May, whenit got underway from Bikini enroute to Pearl Harbor with a Project 1.4 barge (YCV-9) in tow. The ship arrived at Pearl Harbor on 18 May and did not return to the PPG during Operation CASTLE. The daily contributions to the integrated free-field intensity on USS TAWAKONI resulting from Shots BRAVO and ROMEOfallout, and from ship contamination, are detailed in table 3.6 for the period 1 March to 31 May 1954. The topside exposure includes shine from the 60