e. Approximately 225 radio men and strikers were made available by Cincpacflt to the four major ships to enable them to maintain efficient operation of all the equipment installed. Six Philco representatives were also furnished to provide technical aid and assistance, which proved to be of great value. Approxi- mately 15 officers were furnished to CJTF 7 in MT. MCKINLEY to act as coding officers and CHO's. Turing the entire operation an approxi- mate total of 20,000 messages were handled, of which approximately 60% were encrypted. 16. To provide for the security of information concerning move- ments of personnel and the conduct of operation SANDSTONE, all persons attached to Task Group 7.5 were required to exeoute a security Pledge. Peter approval or Queen clearance was mandatory for all persons in the area after the limiting date of 1 February. Security clearance was granted to a total of 6881 Havel personnel plus approxi- mately 400 attached to Fitrwilliam vessels. Vessels which were au- thorized to enter the Danger Area were required to impound all photographic equipment and supplies while in the Danger Area and for the short periods they were present at Eniwetok were not permitted any shore liberty. A program of talks and instruction periods was | carried out to make TG 7.3 personnel security conscious. In addi- tion, upon arrival of MT. MCKINLEY, CURTISS, ALBEMARLE and BAIROKO at Eniwetok, these ships established a security guard which was stationed topside om each ship; this guard consisted of 1 of ficer and 10 guards on watch at all times while at anchor. Section VII 76

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