8 August 1998
Source: http://web7.whs.osd.mil/text/d510020p.txt

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Department of Defense

DIRECTIVE

NUMBER 5100.20

December 23, 1971

Administrative Reissuance Incorporating Through Change
4, June 24, 1991

ASD(I)

SUBJECT:  The National Security Agency and the Central
Security Service 

References:  (a)  National Security Council Intelligence
Directive No. 6

1.  PURPOSE 

This directive prescribes authorities, functions, and
responsibilities of the National Security Agency (NSA)
and the Central Security Service (CSS).

2.  CONCEPT 

2.1.  Subject to the provisions of NSCID No. 6, and
the National Security Act of 1947, as amended, and pursuant
to the authorities vested in the Secretary of Defense,
the National Security Agency is a separately organized
agency within the Department of Defense under the direction,
supervision, funding, maintenance and operation of the
Secretary of Defense.

2.2.  The National Security Agency is a unified organization
structured to provide for the Signals Intelligence (SIGINT)
mission of the United States and to insure secure communications
systems for all departments and agencies of the U.S.
Government.

2.3.  The Central Security Service will conduct collection,
processing and other SIGINT operations as assigned.

 Declassified on May 22, 1990

by the Director of Administration and Management,

Office of the Secretary of Defense

(Authority:   E.O. 12356, April 6, 1982)

3.  DEFINITIONS 

3.1.  Signals Intelligence (SIGINT)  is a category of
intelligence information comprising all Communications
Intelligence (COMINT), Electronics Intelligence (ELINT),
and Telemetry Intelligence (TELINT).

3.2.  COMINT  is technical and intelligence information
derived from foreign communications by other than the
intended recipients.   COMINT is produced by the collection
and processing of foreign communications passed by electromagnetic
means, with specific exceptions stated below, and by
the processing of foreign encrypted communications,
however transmitted.   Collection comprises search,
intercept, and direction finding.   Processing comprises
range estimation, transmitter/operator identification,
signal analysis, traffic analysis, cryptanalysts, decryption,
study of plain text, the fusion of these processes,
and the reporting of results.   COMINT shall not include:

3.2.1.  Intercept and processing of unencrypted written
communications, except the processing of written plain
text versions of communications which have been encrypted
or are intended for subsequent encryption.

3.2.2.  Intercept and processing of press, propaganda
and other public broadcasts, except for processing encrypted
or "hidden meaning" passages in such broadcasts.

3.2.3.  Oral and wire interceptions conducted under
DoD Directive 5200.24.

3.2.4.  Censorship.

3.3.  ELINT  is technical and intelligence information
derived from foreign, non-communications, electromagnetic
radiations emanating from other than atomic detonation
or radioactive sources.   ELINT is produced by the collection
(observation and recording), and the processing for
subsequent intelligence purposes of that information.

3.4.  TELENT  is technical and intelligence information
derived from the intercept, processing, and analysis
of foreign telemetry.

3.5.  SIGINT  operational control is the authoritative
direction of SIGINT activities, including tasking and
allocation of effort, and the authoritative prescription
of those uniform techniques and standards by which SIGINT
information is collected, processed and reported.

3.6.  SIGINT resources  comprise units/activities and
organizational elements engaged in the conduct of SIGINT
(COMINT, ELINT or TELINT) activities.

4.  APPLICABILITY 

The provisions of this directive apply to the Office
of the Secretary of Defense, the Military Department,
the Joint Chiefs of Staff, the Unified and Specified
Commands, the National Security Agency, the Central
Security Service, and other Defense Agencies hereinafter
called Department of Defense Components.

5.  ORGANIZATION AND RESOURCES 

5.1.  The SIGINT resources of the Department of Defense
will be structured to accomplish most efficiently and
effectively the SIGINT mission of the U.S.

5.2.  The National Security Agency shall consist of
a Director, a Headquarters, and such subordinate units,
elements, facilities, and activities as are assigned
to the National Security Agency by the Secretary of
Defense in his role as the executive agent of the Government
for the conduct of SIGINT.

5.3.  The Central Security Service is comprised of a
Chief, Central Security Service, a Deputy Chief, a jointly
staffed headquarters, Army, Navy/Marine Corps and Air
Force operating elements, and such other subordinate
elements and facilities as may be assigned to the Central
Security Service by the Secretary of Defense.

5.4.  The Director, National Security Agency, shall
also be the Chief, Central Security Service.

5.5.  The Director of the National Security Agency/Chief,
Central Security Service shall have a Deputy Director
for the National Security Agency and a Deputy Chief,
Central Security Service.   To provide continuity in
SIGINT matters the Deputy Director, National Security
Agency, shall be a technically experienced civilian.
  The Deputy Chief, Central Security Service, shall
be a commissioned officer of the Military Services,
of not less than two star rank, designated by the Secretary
of Defense.   The Deputy Chief will normally not be
selected from the same Military Service as the Chief.

5.6.  The Director and Deputy Director of the National
Security Agency shall be designated by the Secretary
of Defense, subject to the approval of the President.
  The Director shall be a commissioned officer of the
Military Services, on active or reactivated status,
and shall enjoy not less than three star rank during
the period of his incumbency.

5.7.  The Director, National Security Agency/Chief,
Central Security Service shall report to the Secretary
of Defense.

5.8.  The Commanders of the Service cryptologic organizations
and their subordinate activities which conduct SIGINT
operations will be subordinate to the Chief, Central
Security Service, for all matters involving SIGINT activities.
  In this role they will be designated as Service element
commanders and subordinate activities of the Central
Security Service.   Unless otherwise specifically provided
in this directive, the Service cryptologic organizations
will remain in their parent Services, for the purpose
of administrative and logistic support.

5.9.  The Secretary of Defense with the advice of the
Joint Chiefs of Staff may specifically designate other
SIGINT-related resources of the Department of Defense
which will be subordinate to the Chief, Central Security
Service for SIGINT operations.

6.  RESPONSIBILITIES AND FUNCTIONS 

6.1.  Subject to the direction, authority and control
of the Secretary of Defense, the Director, National
Security Agency/Chief, Central Security Service shall:

6.1.1.  Accomplish the SIGINT mission of the National
Security Agency/Central Security Service.

6.1.2.  Act as principal SIGINT advisor to the Secretary
of Defense, the Director of Central Intelligence, and
the Joint Chiefs of Staff.   As principal SIGINT advisor
to the Joint Chiefs of Staff, the Director, National
Security Agency will keep the Joint Chiefs of Staff
fully informed on SIGINT matters.

6.1.3.  Exercise SIGINT operational control over SIGINT
activities of the U.S. Government to respond most effectively
to military and other SIGINT requirements.   In the
case of mobile military SIGINT platforms, he shall state
movement requirements through appropriate channels to
the military commanders, who shall retain responsibility
for operational command of the vehicles.

6.1.4.  Provide technical guidance to all SIGINT or
SIGINT-related operations of the U.S. Government.

6.1.5.  Formulate programs, plans, policies, procedures
and principles.

6.1.6.  Produce and disseminate SIGINT in accordance
with the objectives, requirements and priorities established
by the Director of Central Intelligence.   (This function
will not include the production and dissemination of
finished intelligence which are the responsibilities
of departments and agencies other than the National
Security Agency/Central Security Service.)

6.1.7.  Manage assigned SIGINT resources, personnel
and programs.

6.1.8.  In relation to the Department of Defense SIGINT
activities, prepare and submit to the Secretary of Defense
a consolidated program and budget, and requirements
for military and civilian manpower, logistic and communications
support, and research, development, test and evaluation,
together with his recommendations pertaining thereto.

6.1.9.  Conduct research, development and systems design
to meet the needs of the National Security Agency/Central
Security Service and coordinate with the departments
and agencies their related research, development, test
and evaluation in the SIGINT field.

6.1.10.  Determine and submit to the Secretary of Defense
logistic support requirements for the National Security
Agency, and the Central Security Service, together with
specific recommendations as to what each of the responsible
departments and agencies of the Government should supply.

6.1.11.  Develop requisite security rules, regulations
and standards governing operating practices in accordance
with the policies of the U.S. Intelligence Board and
the U.S. Communications Security Board.

6.1.12.  Prescribe within his field of authorized operations
requisite security regulations covering operating practices,
including the transmission, handling, and distribution
of SIGINT material within and among the elements under
his control; and exercise the necessary monitoring and
supervisory control to ensure compliance with the regulations.

6.1.13.  Make reports and furnish information to the
U.S. Intelligence Board or the U.S. Communications Security
Board, as required.

6.1.14.  Respond to the SIGINT requirements of all DoD
components and other departments and agencies.

6.1.15.  Eliminate unwarranted duplication of SIGINT
efforts.

6.1.16.  Standardize SIGINT equipment and facilities
wherever practicable.

6.1.17.  Provide for production and procurement of SIGINT
equipments.

6.1.18.  Provide the Director of Central Intelligence
through the Secretary of Defense with such information
as required on the past, current and proposed plans,
programs, and costs of the SIGINT activities under his
control.

6.1.19.  Provide guidance to the military departments
to effect and insure sound and adequate military and
civilian SIGINT career development and training programs,
and conduct, or otherwise provide for, necessary specialized
and advanced SIGINT training.

6.1.20.  Provide technical advice and support to enhance
SIGINT arrangements with foreign governments, and conduct,
as authorized, SIGINT exchanges with foreign governments.

6.1.21.  Perform such other functions as the Secretary
of Defense assigns.

7.  AUTHORITIES 

7.1.  Subject to the authority, direction and control
of the Secretary of Defense, the Director, National
Security Agency/Chief, Central Security Service, is
specifically delegated authority to:

7.1.1.  Exercise SIGINT operational control over SIGINT
activities of the United States.

7.1.2.  Issue direct to any of his operating elements
such instructions and orders necessary to carry out
his responsibilities and functions.

7.1.3.  Have direct access to, and direct communications
with, any element of the U.S. Government performing
SIGINT functions.

7.1.4.  The authority in paragraphs 7.1.1.,7.1.2., and
7.1.3. above is subject to review, approval and control
in accordance with procedures determined by the Secretary
of Defense.

7.1.5.  Adjust as required, through the Service cryptologic
organizations, personnel resources under his SIGINT
operational control.

7.1.6.  Centralize or consolidate SIGINT operations
for which he is responsible to the extent desirable,
consistent with efficiency, economy, effectiveness,
and support to field commanders.

7.1.7.  Submit, as appropriate, concurrent/letter of
evaluation efficiency/fitness reports on the commanders
of subordinate elements of the Central Security Service
in accordance with parent Service procedures.

7.1.8.  Delegate SIGINT operational tasking of specified
SIGINT resources and facilities for such periods and
or such operational tasks as required or as directed
by the Secretary of Defense.

7.1.9.  Prescribe SIGINT procedures for activities to
whom he provides technical guidance.

7.1.10.  Prescribe, or review and approve security rules,
regulations and instructions, as appropriate.

7.1.11.  Conduct those SIGINT operations undertaken
in support of certain missions within the purview of
NSCID No. 5.

7.1.12.  Obtain such information and intelligence material
from the departments and agencies (Military Departments,
other Department of Defense agencies, or other departments
or agencies of the Government) as may be necessary for
the performance of the National Security Agency/Central
Security Service functions.

7.1.13.  Maintain a departmental property account for
the National Security Agency and the Central Security
Service headquarters.

7.2.  Other authorities, specifically delegated by the
Secretary of Defense or by other proper authority to
the Director, National Security Agency/Chief, Central
Security Service in other directives or issuances, will
be referenced in an Enclosure to this directive.

8.  RELATIONSHIPS 

8.1.  In the performance of its responsibilities and
functions, the National Security Agency/Central Security
Service shall:

8.1.1.  Coordinate actions, as appropriate, with other
DoD Components, and other departments and agencies of
the Government.

8.1.2.  Maintain direct liaison, as appropriate, for
the exchange of information and advice in the field
of its assigned responsibility with other DoD Components
and other departments and agencies of the Government.

8.1.3.  Coordinate with other DoD Components and other
departments and agencies of the Government to make maximum
use of established facilities to preclude unnecessarily
duplicating such facilities.

8.1.4.  Provide for direct liaison by representatives
of the intelligence components of individual departments
and agencies regarding interpretation and amplification
of requirements and priorities within the framework
of objectives, requirements, and priorities established
by the Director of Central Intelligence.

8.2.  Other DoD Components shall provide support, within
their respective fields of responsibility, to the Director,
National Security Agency/Chief, Central Security Service
as may be necessary to carry out his assigned responsibilities
and functions.

9.  ADMINISTRATION 

9.1.  To the extent applicable and consistent with the
functions assigned to the National Security Agency/Central
Security Service, Department of Defense policies, regulations
and procedures will govern.

9.2.  The National Security Agency/Central Security
Service will be authorized such personnel, facilities,
funds and other administrative support as the Secretary
of Defense deems necessary for the performance of its
functions.   Other DoD Components shall provide support
for the Agency/Service as prescribed in specific directives
or support agreements.

10.  CANCELLATION 

To the extent they are inconsistent herewith, DoD Directive
S-5100.20, "The National Security Agency," dated March
19, 1959, DoD Directive S- 3115.4, "Communications Intelligence,"
dated March 19, 1959, and DoD Directive S-3115.2, "Electronics
Intelligence," dated February 7, 1967 are hereby canceled.

11.  EFFECTIVE DATE AND IMPLEMENTATION 

11.1.  This directive is effective upon publication.

11.2.  To meet the provisions of this Directive, the
Director, National Security Agency will develop a plan
to implement this Directive including establishment
of the Central Security Service for approval by the
Secretary of Defense with the advice of the Joint Chiefs
of Staff.

11.3.  When the Central Security Service is established
under the terms of this Directive and the approved implementing
plan, all Department of Defense Components will review
their existing directives, instructions, and regulations
for conformity and submit necessary amendments thereto
to the Assistant Secretary of Defense (Intelligence)
within ninety (90) days.

Enclosures - 1 

1.  Listing of Specific Delegations of Authority

E1.  ENCLOSURE 1

Listing of Specific Delegations of Authority by the
Secretary of Defense to the Director of the National
Security Agency

E1.1.1.  Administrative authorities required for the
administration and operation of the National Security
Agency, as prescribed in DoD Directive 5100.23, dated
May 17, 1967.

E1.1.2.  Authority to authorize or request the procurement
of cryptologic material and equipment by the Military
Departments, as prescribed in DoD Directive 5160.13,
dated March 20, 1956.

E1.1.3.  Authority to establish and administer programs
of training, as prescribed in DoD Directive 1430.4,
dated August 5, 1969.

E1.1.4.  Authority to assign the classification of TOP
SECRET, as prescribed in DoD Directive 5200.1, "DoD
Information Security Program Regulation," authorized
by DoD Directive 5200.1, June 1, 1972.

E1.1.5.  Authority to determine the eligibility of individual
civilian officers and employees to transport or store
their privately owned motor vehicles at Government expense,
in accordance with provisions of DoD Directive 1418.3,
dated June 28, 1965.

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