Communications CJTF SEVEN No. 3-53 6. Assignment of Commmication Responsibilities a, Mission, J-5 Division, Headquarters, JTF SEVEN (1) Coordinate overall task force commnications and electro- nics activities. (2) Assign and control all radio frequencies, call signs, address groups and routing indicators. (3) Maintain operational control of the communications security monitoring unit. Prepare for CJTF SEVEN reports of security violations. (4) Operate communications center and crypto facilities at Hqs, JTF SEVEN, Washington 25, D. C. (5) Control utilization of teleconferencing facilities in the ENIWETOK=BIKINI area, (6) Prepare Headquarters, JTF SEVEN telephone directory. (7) Prepare and distribute COIs (Communication Operation Instructions). (8) Provide for operation and maintenance of terminal VHF ciphony facilities (USS ESTES = ° Enya (9) Control distribution of available SIGTOT-SAMSON equipment and tapes to meet operational requirements of the task force. (10) Maintain a transmission security training program for all users of voice radio facilities and a message drafter improvement program to insure most efficient use of limited operational commnication facilities. (11) Prepare and distribute to all task groups the Operation CASTLE Joint Authentication System (AFSAL 5369). b. Scientific Task Group (TG 7.1) (1) Operate and maintain special electronic and communications equipment required by the Scientific Task Group; this to include E.G. & G. terminal equipment at PARRY and ENYU for the TG 7.1 HF duplex voice and RATT circuits. (2) Initiate volce-time broadcast for all elements of the task force, c. Army Task Group (1 7.2) (1) Operate and maintain relay center, ENIWETOK. (2) Operate and maintain communications centers for Hqs, JTF SEVEN (PARRY ISLAND), Hqs, 1G 7.2 (ENIWETOK ISLAND) and in support of AEC operations at BIKINI ATOLL. (3) Provide crypto guard facilities for Hqs, JTF SEVEN, TG 71, 7.25 Teh, 7-5 and for other than intra TG 7.3 (ashore) traffic. 1-6