plans. During the on-site phase most of the security planning of the previous several months moved toward fulfillment, It is difficult to overemphasize the impact on the Task Force of the security program——-the overall mission of which was to promote security from within and without. Though it was concluded after the completion of CASTLE that no attempts were made by hostile forces to penetrate or compromise the operation, it had been necessary to maintain a widespread and continuous patrol over the area throughout the course of operations. And for Operation CASTLE, the use of Bikini Atoll introduced an entirely new perspective, The danger area became almost twice the size of that established for IVY and, after the first shot, had to be further enlarged. Since the naval air and surface forces provided for security patrol were not greatly augmented beyond those provided during IVY, the actual physical accomplishment of the security mission was complicated. Inspite of this enlargement, however, there arose few critical difficulties which were greater than anticipated. The major internal security problem in the forward area, although routine in a sense, was in connection with the initiation of the badge system, Each individual located onParry Island or on the Eberiru group to the north at Iniwetok Atoll, as well as each individual at Bikini Atoll, was required to wear a badge which indicated his clearance status and the degree of access he held to restricted or limited areas, The failure on the part of some 7 108