Ne (2) Proper prededence (3) Proper abbreviations e@, Task Unit Commanders will bring to the attention of all message drafters the contents of COI No, 10-7 "Preparation of Messages." f, ACP 124(A) "Communication Instructions ~ Radio Telegraph Procedure" will be complied with. 6. ‘TELEPHONEUSAGE: ae In the Zone of Interior, no classified information will be b. In the forward area wire telephone facilities cleared for ' @iscussed. over the telephone. conversations up to and including SECRET will be available at: (1) ENIWETOK ISLAND (400 line diel exchange with connecting service to other islands of ENIWETOK ATOLL) (2) BIKE ATOLL (connecting service between necessary is- (3) PARRY ISLAND (270 line manual with connecting service to other islands of ENIWETOK ATOLL) lands (4)' Telephone cables to buoys (providing wire telephone service to designated ships c. VHF (FM) radio relay equipment will be provided at key points as a backeup for wire and cable telephone facilities, but communications will-be limited to unclassified conversations and message traffic when such facilities are in use. TELEPHONE OPERATORS WILL INFORM TELEPHONE USERS IN ALL CASES WHEN CALLS ARE ROUTED OVER VHF RADIO RELAY FACILITIES AND USERS WILL BE INFORMED THAT CONVERSATIONS MUST BE CONFINED TO UNCLASSIFIED MATTERS, ad. ACP 134(A) "Joint Communications Instructions Appendix IV - Telephone Switchboard Operating Procedure" will be complied with. e. TOP SECRET and AEC RESTRICTED DATA material will not be trans— mitted in plain language over telephone circuits, either wire or radio re~ lay. 7. RADIO TELEPHONE PROCEDURE: The following informatiom on Commumi- cations Security, based in general on material contained in ACP 125(A) "Commmnications Instruction Radio Telephone Procedure," is published here for the guidance of all personnel and for compliance by those personnel using HF, VHF, or UHF radiotelephone circuits, a. Conmmmications Security: (1) In the interest of security, transmission by radiotele~ phone will be as short and concise as possible consist~ ent with clearness. Since personnel other than trained operators frequently operate radiotelephone equipment, all personnel must be cautioned that transmissions by radiotelephone are subject to enemy interception and therefore have no security. TASK GROUP 7.4 OPRS ORDER NO. 1-54 ANNEX E, APNDX 3 £3-3