radioteleprinters can be relayed, as well as voice, using this  circuit. SECURE VOICE WORLDWIDE VOICE NETWORK The secure voice network is designed to provide red-time  voice  communications  between  forces  afloat and  operational  commanders  ashore,  using  either  HF  or satellite  connectivity.  This  system  is  commonly referred to as GPS Worldwide HICOMM. System Control This system consists of three separate networks. Each network has an area control station controlled by a FLTCINC; either CINCLANTFLT, CINCPACFLT, or CINCUSNAVEUR. Each area has subarea control stations  determined  by  each  FLTCINC  to  ensure worldwide coverage. Satellite System Control The   secure   voice   system,   using   satellite transmissions, has limited shore access points at the four   COMMAREA   master   stations   and NAVCOMTELSTA  Stockton,  California.  These  sites serve as the interface channel to both the wideband and narrowband voice systems in order to extend calls to operational commanders ashore. Net Membership If a ship, aircraft, or shore station needs to enter the secure voice network, it must be prepared to do so with minimum time delay. Units desiring to enter the net on a temporary basis must specify the length of time and purpose  for  entering  the  net.  They  must  also  obtain permission from the appropriate control station. The area  net  control  station  (NECOS)  is  responsible  for completing all calls originating from senior commands to all commands, ships, or aircraft within the specific FLTCINC’s net. Certain rules must be observed when on the secure voice net, as follows: HF  transmitter  tuning  is  prohibited  on  secure voice.  Transmitters  must  be  calibrated  and pretuned on a dummy load. Final tuning may be accomplished during live transmissions. All stations must maintain a continuous log on secure voice. The actual time of significant transmissions must be entered into the log. When available, recording devices must be used in lieu of a paper log. The net operates as a free net unless otherwise directed by the area FLTCINC. NECOS retains the  prerogative  of  exercising  control  over  all transmissions  to  ensure  proper  circuit  discipline. FULL-PERIOD TERMINATIONS Full-period terminations are dedicated circuits that provide communications between shore stations and afloat   commands.   These   terminations   require allocation   of   limited   NCTAMS/NCTS   assets. Therefore, the criteria for requesting, approving, and establishing such circuits is necessarily strict. Termination   Requests Afloat commands and individual units can request full-period  termination  during  special  operations, deployments, intensive training periods, or exercises when primary ship-shore circuits will not suffice. Commands  should  request  full-period  terminations only when traffic volume exceeds speed and capability of ship-shore circuits and when operational sensitivity requires circuit discreetness or effective command and control necessitates dedicated circuits. T h e    h e a v y    d e m a n d s    p l a c e d    u p o n NCTAMS/NCTSs for full-period terminations require maximum cooperation between shore stations and afloat commanders prior to and during an operation. Ships having a need for a full-period termination, either for training or operational requirements, must submit a termination  request  to  the  COMMAREA  master  station at least 48 hours prior to activation time. Emergency commitments or a command directive may necessitate a lead time of less than 48 hours. Whenever possible, however, the 2-day limit must be honored   to   achieve   maximum   preparation   and coordination.   NTP   4   gives   details   of   required information that must be included in a termination request message. The COMMAREA master station will assign a shore station for a ship’s termination circuit. Once the shore station has been assigned, both the ship and the station may begin coordination to identify specific equipment keylists and frequencies needed to effect termination. The shore station will also act as NECOS. Two hours prior to the scheduled termination, the shore station  can  coordinate  with  the  ship  by  telephone,  local circuitry, or by primary ship-shore. When the ship shifts terminations, the securing of the current termination and the establishment of a new 1-13