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FM 11-23
a. To group, separate battalion, and separate senger service for headquarters supported by
company headquarters. units of the USASTRATCOM (theater). The
motor messenger teams of the messenger service.
b. To activities and installations, when located
Fixed-wing aircraft of the system provide schedmore
than 5 km from the next higher echelon, that
uled messenger service between the message
introduce signal traffic directly into the commonuser
system without reference to a superior head- relay stations Rotary-wing aircraft provide
scheduled messenger service to the small type
communications centers. Nonscheduled air mesc.
To battalions and companies not collocated senger service is provided as required, but serves
with the next higher headquarters. principally the major headquarters in the
COMMZ.
5-9. Messenger Doctrine
a. U.S. Army Strategic Communications Com- 5-10. Signal Center Doctrine
mantd Units. These units having organic -local A signal center, installed, operated, and mainmessenger
capability are responsible for provid- tained by a signal organization of USASTRATing
local messenger service for the supported COM (theater), is provided each of the large,
headquarters, and between the supported head- medium, and small headquarters located within
quarters and the headquarters of the following: the COMMZ. There are two types of signal center
(1) Groups, separate battalions, separate installations: a command signal center and an
companies, and separate installations of the sup- area signal center. A command signal center
ported headquarters complex not having their provides communications support to a specific
own organic messenger service or access to the command and, when required, to units within its
TACS long distance messenger service.
immediate vicinity. An area signal center provides
communications support within its geo-
(2) Battalions, companies, and installations graphical area of responsibility to all units renot
collocated with their next higher echelon of
command and not having their own organic mesquiring
communications.center services to supple-
ment their organic means.
senger service or access to the TACS long distance
messenger service. 5-11. Tropospheric Scatter Doctrine
(3) Between the supported headquarters
In the COMMZ of a theater of operations, where
and the message relay stations ȧnd the message relay stations. major headquarters such as theater, theater
b. Long Distance Theater Messenger Service. A army, theater navy, theater air force, and TASlong-distance
theater air and ground messenger COM require extended distance highly reliable,
system having an objective 24-hour service sched- multichannel communications links for command
ule is established by the signal messenger com- and control of theater operations, tropo links are
pany. It operates in the area from the rear of the used. The command communications system of
COMMZ to the rear of the field army. The sys- the TACS is provided primarily by tropo links.
tem, consisting of message relay stations in- Tropo links also are provided to establish other
stalled and operated along the axis of the LOC's headquarters-to-headquarters links as required,
and where possible collocated with signal com- for restorative purposes and to provide an overmunications
centers, provides long distance mes- jump capability.
5-10