Category: SSIC 02000 Telecommunications
Updated: 06/24/96
Number: MCO 2201.1

WASHINGTON, DC 20380-0001
MCO 2201.1
9 Sep 1983


From: Commandant of the Marine Corps
To: Distribution List

Subj: Communications Security (COMSEC)

Ref: (a) CMS-4K
(b) CPS-1
(c) NTP-7
(d) OPNAVINST 05510.93D (NOTAL)
(e) MCO 1510.2H


1. Purpose. To prescribe Marine Corps Communications Security

(COMSEC) policy.

2. Scope. This order promulgates information derived from
national, Department of Defense and Navy COMSEC doctrine and
policy and establishes Maine Corps COMSEC policy.

3. Background. The security of governmental telecommunications
is a national responsibility. All military services must
satisfy the Communications Security requirement of the National
Security Council (NSC). The Marine Corps works in consonance
with the Department of the Navy to attain this goal. This
Order will formalize the Marine Corps direction and policy as
it pertains to COMSEC.

4. Information

a. The National Communications Security Committee (NCSC)
is the U.S. Government's authority for promulgation of policy
and guidance on COMSEC. Under NCSC policy, and in collaboration
with the departments and agencies of the U.S. Government, the
National Security Agency (NSA) develops and promulgates guidance
on control of COMSEC material.

b. The Secretary of Defense (SecDef) is the U.S.
Government's Executive Agent for COMSEC. The Director, NSA
acts for the SecDef in all COMSEC. The Director, NSA acts for
the SecDef in all COMSEC matters concerned with the security of
governmental telecommunications.

c. The Chief of Naval Operations (CNO) is the overall
authority for COMSEC policy within the Department of the Navy.

PCN 102 028151 00

The Commander, Naval SEcurity Group (COMNAVESECGRU) administers
the Navy COMSEC program. The Commander, Naval Telecommunications
Command (COMNAVTELCOM) is the manager for COMSEC equipment,
related devices, equipment maintenance manuals and operating
instructions. The Director, Communications Security Material
System (DCMS) is responsible for ensuring the proper security,
distribution, handling, and accounting of COMSEC material in
the COMSEC Material System.

d. The Director, Command, Control, Communications and
Computer System Division (DirC4SysDiv) (CMC (Code CCT)) has
overall authority for COMSEC policy within the Marine Corps.
The Marine Corps conforms to all COMSEC related directives
originated by the organizations listed in subparagraphs 4a
through c above.

5. Policy

a. The COMSEC goal of the Marine Corps is to provide total
security for all transmitted information from the originator to
the recipient in accordance with references (a) through (d).

b. The Marine Corps will use DCMS procedures in handling
and accounting of Communications Security Material System (CMS)
material. Only properly trained personnel will handle CMS
material. Specific guidance may be found in references (a),
(b) and (c).

c. Operation of CMS accounts is a command responsibility.
The CMS custodian acts in behalf of the commander. Only
individuals who have completed a DCMS administered CMS formal
school will be assigned as CMS custodians.

d. CMS violations are serious. Repeated or flagrant CMS
violations may warrant administrative and/or disciplinary

e. Commercially developed privacy equipment using the Data
Encryption Standard (DES) will not be used except as approved
by CMC (Code CCT). Use of DES equipment by Fleet Marine Force
units is not anticipated.

f. Access to COMSEC equipment, keying materials and
maintenance manuals will be on a strict need-to-know basis.

6. Action

a. Commanders will be guided by the following

(1) COMSEC will be considered during all phases of
operational planning.

(2) Only cryptographic equipment, authentication
systems or keying material produced or approved by the
Director. NSA will be employed in the Marine Corps.


(3) Homemade codes will not be used.

(4) Marine Corps telecommunications centers, signal
intelligence facilities, word processing and automated data
processing facilities will comply with TEMPEST policies contained
in reference (d). Requests for TEMPEST surveys will be forwarded
to COMNAVTELCOM via the chain of command (info CMC (Code CCT))
in accordance with instructions contained in reference (d).

(5) Tactical communications circuits will be secured
to the maximum extent possible, consistent with availability of
COMSEC equipment.

(6) Daily changing frequencies and call signs will be
used to the maximum extent possible. Static tactical call signs
and fixed suffixes will be used only when operational
considerations override the use of daily changing call signs.

(7) Physical security of COMSEC material will be

(8) Emphasis will be placed on COMSEC in unit training.
At a minimum the Essential Subject Test, Section II, Security of
Military Information, will be part of unit training.

(9) CMS insecurities will be reported in accordance
with reference (a).

b. CG, FMFLANT and CG, FMFPAC will ensure CMS inspections of
subordinate commands are conducted in accordance with reference

c. The Director, Command, Control, Communications and
Computer Systems Division (Code CCT) has general staff
responsibility for the development of concepts, estimates,
plans and overall Marine Corps requirements concerning COMSEC.
In the discharge of these duties, the DirC4SysDiv (Code CCT)

(1) Monitor telecommunications plans to ensure
compliance with established COMSEC policies and standards.

(2) Set priorities for distribution of COMSEC

(3) Serve as the Headquarters staff agency for
coordination with the Office of the Secretary of Defense, the
Office of the Joint Chiefs of Staff, NSA and other military
services on COMSEC matters.

(4) Identify and validate Marine Corps COMSEC
equipment requirements to CNO.


(5) Ensure that CMS inspections of HQ FMFLANT,
HQ FMFPAC, Marine Corps bases and stations and other commands
which report directly to Headquarters Marine Corps are performed
in accordance with reference (a).

(6) Evaluate reports of CMS violations.

(7) Prescribe Marine Corps procedures for handling
COMSEC material.

(8) Prescribe Marine Corps procedures for use of DES

d. The Deputy Chief of Staff for Installations and
Logistics (DC/S I&L) (CMC (Code L)) has general staff
responsibility for the development and supervision of the
Marine Corps logistics system with regard to COMSEC materials
and supplies. The DC/S I&L will:

(1) Develop logistics policies, including Integrated
Logistics Support concepts, procedures, and guidance for
distribution, supply and maintenance of COMSEC equipment
ancillaries used in support of Marine Corps telecommunications

(2) Assist the DirC4SysDiv in identifying and
validating program and budget requirements in support of
COMSEC logistics functions.

e. The Deputy Chief of Staff for Training (DC/S Trng)
(CMC (Code T)) has general staff responsibilities for the
development of policies and programs for the training and
education of Regular and Reserve Marine Corps personnel and
units. As this relates to COMSEC, DC/S Trng will:

(1) Formulate, develop and publish individual and
collective COMSEC training standards for use in Marine Corps
units and training institutions.

(2) Determine COMSEC training support requirements and
allocate resources to satisfy those requirements.

7. Reserve Applicability. This Order is applicable to the
Marine Corps Reserve.

Director, Command, Control,
Communications and Computer
(C4) Systems Division


Copy to: 8145001



a. Communications Security (COMSEC) - The protection
resulting from all measures designed to deny unauthorized
persons information of value which might be derived from the
possession and study of telecommunications, or to mislead
unauthorized persons in their interpretation of the results of
such possession and study. COMSEC includes; cryptosecurity,
transmission security, emission security, and physical security
of communications security material and information.

(1) Cryptosecurity - The component of communications
security which results from the provision of technically sound
cryptosystems and their proper use.

(2) Transmission Security - The component of
communications security which results from all measures
designed to protect transmission from interception and
exploitation by means other than cryptoanalysis.

(3) Emission Security - The component of
communications security which - results from all measures taken
to deny unauthorized persons information of value which might
be derived from intercept and analysis of compromising
emanations from cryptoequipment and telecommunication

(4) Physical Security - The component of communications
security which results from all physical measures necessary to
safeguard classified equipment, material, and documents from
access thereto or observation thereof by unauthorized

b. Communications Security Equipment - Equipment designed
to provide security to telecommunications by converting
information to a form unintelligible to an unauthorized
interceptor and by reconverting such information to its
original form for authorized recipients as well as equipment
designed specifically to aid in, or as an essential element of,
the conversion process. Communications security equipment is
cryptoequipment cryptoancillary equipment,
cryptoreproduction equipment and authentication equipment.

c. Communications Security Material - All documents,
devices, equipment, or apparatus, including cyrptomaterial,
used in establishing or maintaining secure communications.

d. Telecommunications - Any transmission, emission, or
reception of signs, signals, writing, images, and sounds or
information of any nature by wire, radio, visual, or other
electromagnetic systems.


e. CRYPTO - A marking identifying all COMSEC keying material
used to protect or authenticate telecommunications carrying
national security-related information. The CRYPTO marking also
identifies COMSEC equipment with installed, hardwired,
operational keying variables.

f. Data Encryption Standard (DES) - An unclassified
cryptoalgorithm published by the National Bureau of Standards
for the protection of certain U.S. Government information.