General. The three types of cryptofacilities (hereafter referred to as facilities) are fixed, mobile, and
transportable. These facilities present different physical security challenges.
a. A fixed facility is vulnerable to both overt and covert attempts to gain access to it and its contents.
The standards to be met in constructing a facility and controlling access are in several Army regulations AR 190-
13, AR 380-5, AR 380-19-1, and AR 380-40). There are a variety of security requirements to meet. The
following are general guidelines:
(1) The facility is located in a secure room or controlled area.
(2) The commander enforces facility access regulations when the facility is used for general office
(3) The facility is located in a building of substantial construction. Entry-resistant and opaque
materials are used.
(4) Needed openings (windows, peepholes, and vents) are covered to prevent unauthorized access or
observation of operations.
(5) The facility has a single door that is used for both entry and exit. There may be emergency exit
doors, but they are secured to prevent unauthorized entry. Those exits use a deadbolt emergency exit device with
a local alarm.
(6) Personal equipment capable of receiving, transmitting, recording, or amplifying emissions cannot
be brought into the facility. These include cameras, radios, tape recorders, and televisions. Only government-
owned items directly associated with COMSEC operations are allowed in the facility.
(7) Electronic control devices cannot substitute for the required combination lock for the facility.
Control devices (cipher locks, keyless pushbuttons, and so forth) may be used with the required combination lock.
These devices may be used only for admitting authorized persons to an occupied or guarded facility. Cipher locks
and keyless pushbuttons are conveniences. They are not used for control or security.
b. The requirements for securing mobile and transportable facilities are about the same. The principles
that apply to fixed facilities apply equally to mobile and transportable facilities.
(1) All transportable and mobile facilities are protected by guards.
(2) The operators can serve as guards. This applies when the facility layout and operator duties make
it feasible for operators to provide adequate control.