Department of Defense
MANUAL
NUMBER 5105.21, Volume 2
October 19, 2012
Incorporating Change 2, Effective November 2, 2020
USD(I&S)
SUBJECT: Sensitive Compartmented Information (SCI) Administrative Security Manual:
Administration of Physical Security, Visitor Control, and Technical Security
References: See Enclosure 1
1. PURPOSE
a. Manual. This Manual is composed of several volumes, each serving a specific purpose,
and reissues DoD Manual (DoDM) 5105.21-M-1 (Reference (a)). The purpose of the overall
Manual, in accordance with the authority in DoD Directive (DoDD) 5143.01 (Reference (b)), is
to implement policy established in DoD Instruction (DoDI) 5200.01 (Reference(c)), and Director
of Central Intelligence (DCI) Directive (DCID) 6/1 (Reference (d)) for the execution and
administration of DoD Sensitive Compartmented Information (SCI) program. It assigns
responsibilities and prescribes procedures for the implementation of DCI and Director of
National Intelligence (DNI) policies for SCI.
b. Volume. This Volume addresses the administration of physical security, visitor control,
and technical security for SCI facilities (SCIFs).
2. APPLICABILITY. This Volume:
a. Applies to OSD, the Military Departments, the Office of the Chairman of the Joint Chiefs
of Staff and the Joint Staff, the Combatant Commands, the Office of the Inspector General of the
Department of Defense, the Defense Agencies, except as noted in paragraph 2.c., the DoD Field
Activities, and all other organizational entities within the DoD (hereinafter referred to
collectively as the “DoD Components”).
b. Applies to contractors in SCIFs accredited by the Defense Intelligence Agency (DIA) and to
DoD SCI contract efforts conducted within facilities accredited by other agencies and approved for
joint usage by a co-utilization agreement.
