DEPARTMENT OF THE NAVY
O
FFICE
O
F THE
S
ECRETA
RY
1000
NA
VY
PENTAGON
WASHINGTON DC 20350·1000
SECNAVINST 3850.4B
DUSN
29 May 2019
SECNAV INSTRUCTION 3850.4B
From: Secretary of the Navy
Subj: TECHNICAL SURVEILLANCE COUNTERMEASURES PROGRAM
Ref: See enclosure (1)
Encl: (1) References
(2) Definitions
(3) Responsibilities
(4) Technical Surveillance Countermeasures Program
Requests
(5) Qualification for Entry into TSCM Field
1. Purpose. This instruction provides policy and defines
specific responsibilities for the implementation of the
Department of the Navy (DON)’s Technical Surveillance
Countermeasures (TSCM) Program. This instruction has been
revised and should be reviewed in its entirety.
2. Cancelation. SECNAVINST 3850.4A.
3. Definitions. See enclosure (2).
4. Applicability. This instruction applies to the Offices of
the Secretary of the Navy (SECNAV), the Chief of Naval
Operations (CNO), the Commandant of the Marine Corps (CMC), the
Naval Criminal Investigative Service (NCIS), and all U.S. Navy
(USN), U.S. Marine Corps (USMC) installations, commands,
activities, field offices, and all other organizational entities
within the DON.
5. Policy. It is DON policy:
a. That TSCM will be used to protect against unauthorized
or inadvertent access or removal of classified Department of
Defense (DoD) information through technical surveillance and
associated devices, technologies, and hazards. It is the
responsibility of every commander to establish a comprehensive
security program for the protection of sensitive information.
TSCM activities may be conducted anywhere classified DoD
