2. Project 2.$a, involving radioactive fallout stuiies conducted ty the U.S, Naval Radiological Defence Laboratory, received heavy and exacting support from the teek group. Two ATFs, APACHE ani SIOUX, were exployed almost fall time in the Project. It was their task to lay free floating den buoys equipped os fallout ecliectors dowmrind froma the detonation point outside the lagoon, than relocate thes after the shot and recover thea, In case of a shot postponeent it nas necessary that- the buoys be recovered, serviced ant replanted, iunediately if the postponent was a brief one, ith the grest number of poctponencita that occurred in CASTLE this task became a heavy one. Sven though the buoys were eqaipped with special radio trensnitters, ani the ATFs with special radioc direction finder equipment, the bucys were hard to locate, The adie aignal eaitted by the buoys weekencd greatly after several hours in the water, axt was not of vary great assietamein the hunt, Vi-29 eiroreft ani the security DDE ware often called upon to help ia the search when they could te spared froa other, sore pressing duties. Once Located, the buoys were hard to handle in the rough seas. Ths handiing problem was made more difficult by the design of the antennas that projected from the tops of the buoys; shaped like short usbrells spokes the antennae endangered the eyes of persomal hendling the buoys and were thenselves easily damaged. Fallout studies inside the lagoon were made by means of raft-barne collectors. A crene-ejuipped LOU handled the refts. Despite the difficulties involved overy effort AFWUHO