Declassified DOD DIR 5200.10 (4) Ship - shore (VHF, "AN/TRC and EF) Declassified DOD DIR 5200.10 (5) AOC ENIWETOK-CIC Command Ship (VHF, AN/TRC and HF) (TG 7.4 controlled) e. Internal Task Group communications and navigational aids will be furnished from existing AACS facilities augmented as necessary to fulfil operational requirements. Control of Task Force aircraft will be centered aboard the Command Ship (AGC) utilizing radar and radio facil- ities to be furnished by TG 7.3. An Air Operations Certer (AOC) on ENIWETOK ISLAND will be responsible for air traffic control and for the maintenance of a plotted picture of the air situation, Airborne commmn- ications and electronic aids for aircraft control will consist of the usual installed electronics equipment together with Mark 10 IFF transponders and interrogators and low frequency radio homing beacons as netessary,. 2. MISSION, HEADQUARTERS TG 7,4: a. Prepare a communications and electronics plan for Operation CASTLE (RESTRICTED, SI). b. Supervise the installation, operation and maintenance of TG 7.4 communications and electronic aids to aerial navigation. c. Procure necessary conmunicatd ons and electronics equipment and supplies to meet requirements of TG 7,4. d. In accordance with Joint Task Force training directives, establish a transmission security training program for all intended users of voice radio facilities and a message drafter improvement program to insure most efficient use of limited operational communications facilities. e. Submit requirements for frequencies, call signs, routing indicators and address group to Headquarters, JTF SEVEN, prior to 1 Septem- ber 1953. f, Submit requirements for communications and electronics facilities for aircraft control in the CIC aboard the AGC and aboard other TG 7.3 ships as required to Headquarters, JTF SEVEN, 3. COMMUNICATIONS TASKS OF SUBORDINATE TaSK GROUP UNITS: a. Test Support Unit: (1) Provide organizational and field maintenance for, and (2) Supervise and operate a Task Group radjo-radar maintenance shop for airborne equipment, This shop will operate communications and electronics equipment installed inassigned aircraft. be augmented by qualified personnel from the Test Air- . craft Unit and the Test Services Unit. (3) (4) Provide and maintain-.necessary inter-communications and public address systems. Install, maintain and operate the aneroet Operations Center equipment in the AOC on K ; TASK GROUP 7.4 OPRS ORDER NO. 1-53 ANNEX D at Declassified D-2 : aH 3 DOD OR 5200MIlixenderty wierenes ocmnee _ Decl bop DIRs2ee, 10