22. Project 2.58, involving radioactive fallout studies conducted by the U.S, Naval Radiological Defence Laboratory, received heavy ent exacting support from the tack group. ‘Two ATMs, APACE aai SIOUL, were exployed almost full time in the Froject. It waa their task to lay free floating den buoys equipped as fallow soliectors dewminid froa the detonation point cubseide the lagoon, then relocate then after the chot and recover thea, In case of a shot postponesent it was necessary that the buoys be recovered, serviced ant replanted, immediately if the post— ponsment was a brief one. dith the grest number of postponenents that occurred ia CASTLE this teek becans a heavy one. Sven though the buoys were equipped with especial radic trenauittera, oxi the ATFs with special redic direction finder equipment, the bacys were hard to locate, The radie afgnal emitted by the bucys weakencd greatly after several hoar's in the water, axt was not of very great ansistane in the hint, ¥i-29 aircraft ani the security DDE were often called upon to help in the search when they could te spared froa other, sore pressing duties, Qnce located, the buoys were hard to handle in the rough sess. The hand ling problem wae mede more difficalt by the design of the antennas that projected from the tops of the buoys; shaped like short unbrells spokes the antennae endangered the eyes of personnal handling the buoys end were themselves easily damaged. Fallout studies inside the lagoon were mede by moans of raft-barne collectors. LOU handled the rafts, AtWidHO A crene-—sjuipped Despite the difficulties involved every effart