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FM 11-23
connected into the command tape relay system, headquarters. The reproduction and distribution
will pass traffic through the small communica- of messages within the headquarters is the retions
centers providing area-type coverage.
sponsibility of the adjutant general element of
(3) COMSEC facilities. Although the long the headquarters is the responsibility of the adlines
communications links throughout the com- jutant general element of the headquarters. Signal
mand communications system employ link secur- personnel are not provided for this purpose.
ity equipment, a requirement exists for terminal Nonscheduled messenger service will be provided
COMSEC facilities. The size and composition of for high priority operational message traffic.
the COMSEC facilities provided are predicated (8) Radioteletypewriter facilities. HF SSB
upon the size of the headquarters and the amount radio teletypewriter facilities are provided for
of classified traffic. To provide on-line terminal major headquarters within the COMMZ. These
COMSEC service, each crypto center will use the facilities provide point-to-point, secure radio teleequipment
and circuitry in the tape relay and typewriter links to higher, lower, and adjacent
manual teletypewriter facilities. On-line en- command headquarters, as a backup to the comcrypted
messages thus may be handled over tape mand multichannel radio, tropo and cable links. In
relay or single address manual teletypewriter cir- addition, these facilities may be used to establish
cuits.
alert warning and rear area protection control
(4) Teletypewriter conference facility. Each nets, and to provide communications for the commajor
command headquarters, such as theater, mander when he is away from the headquarters
theater army, and TASCOM, is provided secure complex.
teletypewriter conference (TELECON) facilities
for command and operational traffic. TELECON 5-3. Area Communications System
circuits are established through coordination
with TACS control and the technical control at In the COMMZ of a theater of operations, many
lower echelons of the USASTRATCOM (the- subordinate commands of the theater army are
ater).
established to provide combat, combat support,
(5) enci- Voice COMSEC and facilities. combat Voice service support to headquarters,
phering equipment is authorized to commanders
units,
units,
and
and
installations.
installations. These subordinate comand
staff officers at major headquarters as pre- mands are widely dispersed throughout the
COMMZ and require extensive communications
scribed by the theater commander. for coordination of operations. These communica-
(6) Message center facilities. The message tions requirements are satisfied by the area comcenter
section of the communications center is the munications system of the TACS.
message processing and handling activity serving
the headquarters. The message center section a. Long Lines Multichannel Radio. The long
maintains constant surveillance over the availa- lines multichannel radio system consists of transbility
of transmission means terminating within mission centers, transmission subcenters, and
the communications center. The message center trunk switching centrals. These installations are
section must be large enough to process and route dispersed along the lines of communications to
outgoing messages, and to process and dispatch provide long lines trunking, patching, and
incoming messages to the staff message control switching. Figure 5-2 shows how these centers
facility of the headquarters served.
and subcenters may be interconnected to form the
(7) Messenger facilities. The communica- area communications system. Microwave multitions
service provided a headquarters includes channel radio is the principal means used for the
signal messenger service in the general vicinity links. However, tropo radio and cable communicaof
that headquarters. These messenger teams also tions systems may be used.
deliver and pick up message traffic at message (1) The transmission centers (fig. 5-3) conrelay
stations of the long distance messenger ser- tain the microwave terminals and also provide
vice. Outgoing messages are delivered to the mes- for patching and switching long line trunk cirsage
relay stations and incoming messages are cuits. At a transmission center, each system may
picked up and delivered to message center sec- be demodulated and the circuits connected at
tions for redistribution to the staff message con- voice frequency into the patching panel. From
trol facility of the headquarters. The reproduc- the patching panel, some circuits are terminated
tion and distribution of messages within the in a switchboard. Other circuits may be routed
5-4