Croration Flan
CTG 7.3 No. 1-53
8. 900, SECURITY
&.
910,RadioSilence.
No recuirenent for radio silence is imnosed
on radio circuits oxcept as may be specifically ordered by CTG 7.3 or
hizher authority. It is exvected that radio silenee on almost all circuite will bo ordereé from several minutes prior to a shot until about one
rinute after the shot.
be
975,3.__lonitering of Radio Traffic.
(1)
The Army Security agoncy (iS..} will provide a communication
security unit, uncer the operation2l control of CJTF SEVEN, for monitor=
ing radio circuits in the Forward Area.
(2)
All low, mediun, and high frequency radio circuits are sub-
Icct to inst-nt interception from fixed land stations or possibly fron
siios, aircraft, or subrarines. Under favorable conditions, VHF and UMF
transrissions are-also susceptible to monitoring by unfriendly forces.
c.
Irconsvission Security
(1)
BasicFrinejnles.
The basic principles of transmission
socurity are outlined in «CF 122(B). In view of the heavy recuircments
arnticipateé cn all circuits, circuit discipline rust be vigorously en~
forced. In addition, the following princinles of security shall apply
in the forward eas
(a
No radio circuit (including V3F and UHF) or telephone
circuit having a idio link is approved for transrissicon of classificd
information in th clear.
(bo) All TOP SECTET and RESTRICTED D.™i nesseges will be
enciphered off-line prior to transmission over SIGTCT circuits.
{c)
Code names will not be assigned to individwals.
use of personal namos on voice radio circuits 1s authorized,
The
(a) Radioteletypo, Cl, and visual message facilities will
be used in lieu of voice radio whenever practicable.
(e)
Personnel onevating voice cirevits shill be thoroughly
feniliar with ACP 125. “here time permits, and especislly on EF circuits,
voice transrissions should be written out and approved by originators
prior to transrission in order to avoid tho inadvertent disclosure cf
classificd matter,
Fe5