nidire rocntle EPs oo a - ce Snier "Ek aa t CUTF SEVEN No > ».-. CF @ . e iin Commnt. ertions set etechernen SRine be anseriPratteite deal ( SRE RENT 3-53 Pt Sg te pTgs te PREY nel | ¥ fate Be Ve era ae| Y ridio equipment between and within ENIWETOK and BIKINI ATCLLS. The use of voice HF radio equipment will be kept to a minimum for security rezsons and will be closely controlled. ‘whenever possible, radio teletypewriter facilities will be used for long distance radio communications beyond the range of VHF equipment. Automatic on-line encryption normally will be used in conjunction with such facilities except where off-line encryption is necessary to meet security re- quirements, Considerable numbers of VHF radio equipment will be used, IT IS MANDATORY THAT CLASSIFIED MATTERS NOT BE DISCUSSED OVER ANY VOICE RADIO CIRCUITS INCLUDING VHF AND UHF RADIOS. a. Communication Security. Particular attention will be ziven to maintenance of comminication security and to speed and accuracy in hendling of message traffic. e. Joint Relay Center. Ali organizetions within the Pacific Proving Ground will be served by one permanent relay-crypto center at ENIWETOK; installed, operated and maintained by TG 7.2. Tributary stations serviced by this relay center will include Hqs, JIF SEVEN, TG 7.2, TG 7.3 (afloat), TG 7.4 and ships as required. Headquarters, JTF SEVEN communications center (PARRY ISLAND) will protect for TG 7.1, TG 7.5 and CIG 7.3 (ashore). In addition, routine naval admin- ' istrative communications will be handled throngh established naval communication facilities. Sy yt 3h ‘eis +5 “8 “ f. Crycto Center. Crypto Center, ENIWETOK, will be crypto guard for all above mentioned tributary stations except CTG 7.3 (afloat) and intra TG 7.3 (ashore) traffic. Radio teletype circuits between. the following saints will provide rapid communications between major forward and rear echelon task force elements and will be operated — with ON-LINE en¢ryption, using SIGTOT and SAMSON (synchronous mixer) for teletype traffic upto and including SECRET. re “ gunoure és | ENIWETOK - OAHU (UHP): s ENIWETOK - BIKINI sf ° te . MPR: os. “Ball Dux (1) -- PARRY — BIKINI (TG 7. 1 cirenit) 4 7 Q * . o ENIWETOK ~ KWAJALEIN | ENIWETOK - LOS ALAMOS/ ENIWETOK ~ AGC (USS ESTES) - Full Dux (1) Full Dux (1) Full Dux (1) Full Dux (1) Full Dux -(1) All TOP SECRET and RESTRICTED DATA traffic will be enciphered off- line prior to transmission. This is necessary to meet AEC requirements and because terminal communications personnel are not in all instences TOP SECRET or "C" cleared. Eo full duplex off-line SISTOT circuit will be operated between the USS BSTROKO and Joint Relay Center, ENIWETOK. 4 ao h. Te lLecon Facilities. _Teiecon facilities5 will be available at vill be subzitted in eccordance with COI item 291. i. Jecal Telezshone Fectlities, ire telephone facilities cleared for conversations up to and including SECRET will be available at: Cl) ENIWETOX ISLAND (L400 line dial exchance with connecting service io other istands of ENTWETOK ATOLL). L-&