General Description of Test Ships YAG-39, YAG-40, LST-611
NAVAL RADIOLOGICAL DEFENSE LAB SAN FRANCISCO CA SAN FRANCISCO United States
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Former Liberty Ships YAGs 39 and 40 were modified for participation in weapons effects tests during Operations CASTLE and WIGWAM, and a third ship, the USS CROOK COUNTY LST-611, was altered and joined the YAGs in Operation REDWING. The ships were rigged for remote operation from below-deck control rooms shielded from gamma radiation. Navigational, communication and engineering functions were performed from these secondary conn spaces. Instruments for the work of fallout collection, ship shielding data collection, water sampling, and ship washdown evaluation were installed so that all could be operated from the shielded spaces. All of the project instrumentation and project communications equipment were removed from the ships after REDWING, and additional modifications were made to the YAGs for their participation in a subsequent BuShips operation. Should these ships be used similarly in the future, of course, suitable project instrumentation would be necessary. Additionally, it is recommended that the radars be changed, at least on the YAGs, more air conditioning be installed, and the habitability of the shielded spaces be improved. The shielding factor of the LST control room should be further investigated and improved if necessary.