e. (2) Proper precedence. (3) Proper abbreviations Task Unit Commanders will bring to the attention of all message drafters the contents of COI No. 10-7 "Preparation of Hessages", f. ACP 124 (A) "Communication Instructions - Radio Telegraph Procedure" will be complied with. 6. TELEPHONE USAGE: a. In the Zone of Interior, no classified information will be discussed over the telephone. b. In the forward area wire telephone facilities cleared for conversations up to and including SECRET will be available at: (i) (2) ENIWETOK ISLAND (400 line dial exchange with connecting service to other islands of ENIWETOK ATOLL). BIKING ATOLL (connecting. service between necessary is~ ‘lands . (3) PARRY ISLAND (270 line manual with connecting service (4) Telephone cables to buoys (providing wire telephone to other islands of ENIWETOK ATOLL). service to designated ships). c. VHF (FM) radio relay equipment will be provided at key points as a back-up for wire and cable telephone facilities, but commmications will be limited to unclassified conversations and message traffic when such facilities are in use, TELEPHONE OPERATORS WILL, INFORM TELEFHONE USERS IN ALL CASES WHEN CALIES ARE ROUTED OVER VHF RADIO RELAY FACILITI£S AND USERS WILL BE INFORMED THAT CONVERSATIONS MUST BE CONFINED TO UNCLASSIFIED MATTERS, d. ACP 134(A) "Joint Communications Instructions Appendix IV- Telephone Switchboard Operating Procedure" will be complied with. 6, TOP SECRET and .EC RESTRICTED DATA material will not be transmitted in plain language over telephone circuits, either wire or radio relay. 7. RADIO TELEPHONE PROCEDURES: The following information on Communi~ cations Security, based in general on material contained in ACP 125 (A) "Communications 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. ¢ (1) ations Sec $ 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, 2=54 ANNEX "E", APNDX 3 _ E3-3