.
.
Operation
CTG 7.3 No. 1-53
8.
900,
SECURITY
&. 910,Silence. No requirement for radio silence is imposed
on radio circuits except as may be specifically ardered by CiG 7.3 or
higher authority,
It is expected that radio silence on almost all cir-
cuits will be ordered from several minutes prior to a shot until about one
minute after the shot,
b.
975,3.__Monitoring of Traf ic.
(1) The Army Security Agency (4S..) will provide a commmnication
security unit, under the operational control of CJTF SEVEN, for monitoring radio circuits in the Forward Area.
(2) All low, medium, and high frequency radio circuits are sub-
joct to instant interception from fixed land stations or possibly fron
ships, aircraft, or submarines.
Under favorable conditions, VHF and UHF
transnissions afecalso susceptible to monitoring by unfriendly forces.
c. Transmission
(1)
Principles.
The basic principles of transmission
security are outlined in ACP 122(B).
In view of the heavy requirements
anticipated on all circuits, circuit discipline must be vigorously enforced. In addition, the following princivles of security shall apply
in the forward area:
(a)
.
No radio circuit (including VHF and UHF) or telephone
circuit having a radio link is approved for transmission of classified
information in the clear.
(>) A221 TOP SECTET and RESTRICTED D:.Ti messages will be
enciphered off-line prior to transmission over SIGTCT circuits.
(c) Code names will not be assigned to individuals, The
use of personal names on voice radio circuits is authorized,
(a) Radioteletype, CW, and visual message facilities will
be used in lieu of voice radio whenever practicable,
(e)
Fersonnel operating voice circuits shall be thoroughly
familiar with ACP 125, Where time permits, and especially on HF circuits,
voice transmissions should be written out and approved by originators
prior to transmission in order to avoid the inadvertent disclosure of
classified matter.
a
P50
DNA