protecting unkeyed COMSEC equipment installed in vehicles and facilities. The commander considers all aspect
of the property and the environment when deciding acceptable security needs and methods for protecting unkeyed
COMSEC equipment.
(2) Operational.
(a) Unkeyed classified COMSEC equipment may be installed in an operational configuration in a
ship, aircraft, vehicle, building, and so forth. When so installed, it may be left unattended. This applies only
when it is protected to the degree the commander believes sufficient to prevent the likelihood of theft, sabotage,
tampering, or access by unauthorized persons.
(b) Where the installed COMSEC equipment is keyed, the provisions of paragraphs 2a and 2b
related to storage apply. This is according to the classification of the equipment and its key.
(c) Installed COMSEC equipment will not be removed from a vehicle for the sole purpose of
providing security. Frequent removal and reinstallation of COMSEC equipment causes equipment failure and
reduces operational readiness.
c. Only limited amounts of essential keying material may be stored in a mobile facility.
(1) The requirement for storage containers and guards, noted above, applies. This is based on the
classification of the cryptomaterial.
(2) Security containers are securely affixed to the facility.
(3) No more than a single edition of keying material is held.
(4) COMSEC holdings are limited to those essential to mission performance.
(5) Unattended mobile facilities containing keying material or keyed COMSEC equipment are
guarded by cleared personnel.
3.
Using COMSEC equipment at unattended sites. The cryptomaterials and cryptokeys used to protect
communications are the key to secure communications. However, as U.S. forces cooperate more with forces of
other nations, certain COMSEC equipment may have to be located at unattended sites. Safeguards must be in
effect for the security of COMSEC equipment at unattended sites.
a. The site must be located in an area under either U.S. or allied control.
b. Adequate U.S. or allied forces must be located in the vicinity of any unattended site. The force must
be sufficient enough to prevent the possibility of enemy capture or temporary occupation of that site.
SS0137
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