ANNEX "EH eed TO OPERATIONS ORDER NO, 2-54 COMMUNICATICNS HEADQUARTERS — TASK GROUP 7,4, PROVISIONAL APO 187, c/o Postmaster San Francisco, California 26 February 1954, 1800 M 1, GENERAL CONCEPT OF COMMUNICATIONS OPERATIONS: a, One pormanent relay - crypto center at ENIVETOK 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, yp to and including 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): b. (1) ENIWETOK-OAHU (UHP): One full duplex radio teletype (2) ENIWETOK-KWAJALEIN: One full duplex multiplex channel (Provided by TG 7.4). (3) ENIWETOK-BIKINI: (4) ENIWETOK-LOS ALAMOS: (5) ENIWETOK-AGC (USS ESTES): channel (Provided by TG 7.2). One full duplex radio teletype channol (Provided by TG 7,2). One full duplex radio teletype channel (Provided by TG 7.2). One full duplex multiplex channel (Provided by TG 7.4). 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 mect AEC requirements and, in additim, terminal communica~ tions porsonnel are not in all instances TOP SECRET or "QUEBEC" cleared, c. On ENIWETOK and BIKINI ATOLLS, wire telephone facilities cleared for conversations up to and including SEORET will be made avail- able to the Task Group by the Joint Task Force, d, Voice radio facilities will be available on a closely con- trolled basis between the following points: (1) ENIWETOK-BIKINI (HF) (2) ENIWETOK-KWAJALEIN-BIKINI (HF) (TG 7,4 controlled) (3) Between ships (UHF, VHF, 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 (TG 7,4 controlled) TASK GROUP 7.4 OPRS ORDER NO. 2=54 ANNEX "Et E-1