(a) (b) (6) (7) (8) One (1) duplex terminal in AACS message center to JTF Joint Relay Center, One /1) simplex terminal in the weather central ENIWETOK to the Task Force Weather Officer, PARRY ISLAND. Install, mintain ond operate necessary AN/TRC back-up for keying and modulation wire lines on ENIWETOK ISLAND, Complete maintenance of all ground equipment operated by the Test Services Unit will be performed by that mit. Perform organizational maintenance of airborne equipmeat and augment the Test Support Unit for field maintenance of airborne equipment. (9) Furnish necessary air traffic control personnel for an approach control facility in the ENIWETOK 0c, (10) Assigned aircraft will have normal communications-elece tronics equipment installed. All airoraft will be equipped with the AN/APX~6 transponder. In addition, . the Sh-16's will have a modified AN/APX-6 interrogator operating in conjunction with the installed radar, 4. GENERAL: a. Signal Officer, TG 7.2, will operate a crystal grinding b. Communications operating instructions (COI's) published by ce, Task unit commanders are responsible for the suppression of facility to provide emergency production of erystals for all elements of the task force. However, every effort will be made to procure required crystals through established supply channels prior to commencement of the operational phase, Headquarters, Joint Task Force SEVEN, will include a list of approved radio and wire circuits, call signs and frequencies, and uniform task force communications operating procedure, electrical interference being generated by equipment of their task units, and will take necessary action to reduce such noises to a point of non~ interference with authorized communications facilities, ad. , Seo Appendix 1 for complete listing of communications cir~ cuits and navigational aids available to all elements of Task Group 7.4, together with frequencies assigned, hours of operation and other pertinent information. e. A list of frequencies authorized for use by al] elements of Joint Task Force SEVEN may be found in Commmications Operation Instruc- tions (COI) Number 20-1. TASK GROUP 7.4 OPRS ORDER NO, 1-54 ANNEX E E-5