ANNEX_E TO OPERATIONS ORDER NO, 1-54, GATIONS HEADQUARTERS TASK GROUP 7.4, PROVISIONAL APO 187, c/o Postmaster San Francisco, California 9 February 1954, 1800 M 1. GENERAL CONCEPT. OF COMMUNICATIONS OPERATIONS: a. One permanent relay - crypto center at ENIWETOK will be installed, operated and maintained by Task Group 7.2. Tributary stations serviced by this relay center will include Headquarters Task Group 7.4, which will be responsible for distribution of messages to its subordinate units. For handling of teletype traffic, up to and incluling SECRET, between major forward and rear echelon task force elements, the following radio teletype circuits will be operated "ON-LINE", using SIGTOT with SAMSON (synchronous mixer): (1) ENIWETOK-OABU channel (2) (UHP): One full duplex radio teletype (Provided by TG 72) ENIWETOK=KWAJALEIN: One ‘full duplex multiplex channel (Provided by TG 7.4). 2 (3) EXTUPTOR-BLEINE One full duplex radio teletype channel (Provided by 1G 7.2). (4) ENIWETOK-LOS ALAMOS: One full duplex radio teletype channel (Provided by TG 7-2). (5) ENIWETOK-AGC (USS ESTES): One full duplex multiplex channel (Provided by TC 7.4). b. 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 "QUEBEC" cleared. ¢. On ENIWETOK and BIKINI ATOLLS, wire telephone facilities cleared for conversations up to and including SECRET will be made avail~ able to the Task Group by the Joint Task Foroe.. d. Voice radio facilities will be available on a closely controlled basis between the following points: (1) ENIWETOK-BIKINI (HF) (2) ENIWETOK-KWAJALEIN-BIKINI (HF) (TG 7.4 controlled) (3) Between ships (UHF, VEF, AN/TRC and HF) (4) Ship - shore (VHF, AN/TRC and HF) (5) AOC ENIWETOK~CIC Command Ship-CVE-Control DDE-ENIWETOK Fighter Control DDE (1G 7.4 controlled) TASK GROUP 7.4 OPRS ORDER NO. 1-54 ANNEX E Eel