HEADQUARTERS, Joint Task Force SEVEN Washington 25, DeCe Annex L to CJTF SEVEN Operation Order No. 1-53 COMMUNICATIONS General Concept of Communications Operations ae One permanent relay-crypto center at ENIWETOK to be installed, operated and maintained by TG 7.2. Tributary stations serviced by this relay center will include: Hq, JIF SEVEN, TG 7.2, TG 7-3, USS ESTES and other ships as required (i.e., CURTISS, CVE, LSD) and TG 7ehe Headquarters, JTF SEVEN communications center will provide for TG 701, TG 705 and TG 7.3 (ashore). be Crypto center, ENIWETOK, will be crypto guard for all above men- tioned tributary stations except TG 7.3 (afloat). For handling of teletype traffic, up to and including SECRET, between major forward and rear echelon task force elements the following radio teletype cir- cuits will be operated "ON-LINE", using SIGTOT with SAMSON (synchro- nous mixer): : OPERATIONAL DATE FOR CIRCUIT TYPE ENIWETOK - OAHU (UHP) SIGTOT-SAMSON OPERATION (TENTATIVE) "Full Dux (1) September 1953 ENIWETOK ~- BIKINI Full Dux (1) June 1953 ENIWETOK — KWAJALEIN Fall Dux (2) October 1953 ENIWETOK - LOS ALAMOS Full Dux (1) August 1953 ENIWETOK ~ AGC (USS ESTES) Full Dux (1) January 1954 Traffic not capable of being handled by means of on-line facilities will be enciphered off-line prior to transmission. All TOP SECRET and RESTRICTED DATA traffic will be enciphered off-line. This is necessary to meet AEC requirements and, in addition, terminal communications personnel are not in all instances TOP SECRET or "Q" clearedo Co Telecon facilities will be available at Headquarters, JIF SEVEN (PARRY ISLAND). Requests for this service will be submitted in accordance with COI item 29-1. de Wire telephone facilities cleared for conversations up to and including SECRET will be available at: (1) ENIWETOK ISLAND (400 line dial exchange) with connecting serv- ice to other islands. (2) BIKINI ATOLL (connecting service between necessary islands). (3) PARRY ISLAND (220 line manual with connecting service to other islands). L-1 nw le