Commnications CJTF SEVEN No. 3-53 e. Personal message service, as outlined in COI 29-2, will be available to all personnel in the ENIWETOK -BIKINI area. f, Radioteletype facilities will be used in lieu of voice radio whenever practicable for communication security reasons. g. Since the new phonetic alphabet (alpha, bravo, coca, etc.) is not being used by all Services, the old phonetic alphabet (able, baker, charlie, etc.) will be used during CASTLE. h. COIs issued by this headquarters will supplement instructions contained herein. i. No cover or deception plan is to be employed except for decep~ tion offered by the rehearsals and for such traffic security as is provided by the use of SIGTOT~SAMSON equipment on RATT circuits. j. No requirements for radio silence are imposed on Joint Task Force SEVEN radic circuits. Commanders of task groups may impose radio silence as required for accomplishment of their mission. 4. Operational Concept, Capabilities and Limitations of the Basic and Commrication Plans a. Task Force Operations. Operation CASTLE will be conducted on both ENIWETOK and BIKINI ATOLLS, which are approximately 180 miles apart. ENIWETOK ATOLL will be the base of operations irrespective of the scope of activities at BIKINI ATOLL. Joint task force and task group headquarters, except CTG 7.3, will be located at ENIWETOK ATOLL, with commanders and key operations staff personnel moving to BIKINI so as to be on site two (2) days before and one (1) day after each shot. Headquarters, TG 7.3, will be located on PARRY ISLAND until about one week prior to the first shot. There- after, it will be located afloat on board the CVE unless otherwise directed, Administrative and logistics staffs will remain on ENIWETOK ATOLL. The Air Force Task Group will be based on ENIWETOK ISLAND. The P2V patrol squadron of TG 7.3 will be based at KWAJALEIN for maintenance and will stage patrol missions through ENIWETOK ISLAND. During shots and rehearsals, command of joint task force air operations will be exercised through the CIC of the command ship. The joint task force air controllers will also control movement of TG 7.4 aircraft and the movements of other aircraft as may be appropriate. b. Affect _on Communications. Operations over such widely disper- sed areas, as wel] as contro] of operations from both ashore and afloat, make reliable and efficient communications a mandatory requirement. c. Types of Communication Facilities. A limited number of submarine cable telephone circuits will be maintained and operated by Task Group 7.5 to inter-connect islands of the ENIWETOK ATOLL and to inter-connect islands of BIKINI ATOLL. Maximum use should be made of these facilities to meet commmication needs within each atoll because of the comminication security afforded by wire facilities. However, the limited number of cable facilities, wide dis-— persion of operations and work parties and the number of aircraft and ships involved will require extensive use of medium (MF), hi (HF) and very high frequency (VHF) and ultra high frequency L-3 (UHF