PERSONNEL AND
READINESS
UNDER SECRETARY OF DEFENSE
4000 DEFENSE PENTAGON
WASHINGTON, D.C. 20301-4000
August 16, 2021
MEMORANDUM FOR SENIOR PENTAGON LEADERSHIP
DEFENSE AGENCY AND DOD FIELD ACTIVITY DIRECTORS
SUBJECT: Directive-type Memorandum (DTM) 21-005 – “Deployment-to-Dwell,
Mobilization-to-Dwell Policy Revision”
References: DoD Directive 5124.02, “Under Secretary of Defense for Personnel and Readiness
(USD(P&R)),” June 23, 2008
DoD Instruction 1235.12, “Accessing the Reserve Components (RC),” June 7,
2016, as amended
DoD Instruction 8260.03, “The Global Force Management Data Initiative
(GFM DI),” February 19, 2014, as amended
Under Secretary of Defense for Personnel and Readiness Memorandum, “Under
Secretary of Defense (Personnel & Readiness) Deployment-to-Dwell,
Mobilization-to-Dwell Policy Revision,” November 1, 2013, hereby cancelled
United States Code, Title 10
Purpose. In accordance with the authority in DoD Directive 5124.02, this DTM:
• Establishes policy for a consistent set of standards to characterize and manage
the employment of the total military force to prevent personnel’s
overexposure to deployments and time away from their homeport, station, or
base.
• Defines “deployment” and “dwell time” under a single Department-wide
standard in accordance with Section 991 of Title 10, United States Code
(U.S.C.). It also defines “deployment-to-dwell ratio for Active Component
(AC),” “mobilization-to-dwell ratio for Reserve Component (RC),” and
associated goals and thresholds.
• Cancels the November 1, 2013 Under Secretary of Defense for Personnel and
Readiness Memorandum.
• Is effective November 10, 2021; it will be incorporated into a DoD
instruction. This DTM will expire effective November 10, 2022.
Applicability. This DTM 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 Inspector General of the Department of Defense, the Defense Agencies, the DoD Field
Activities, and all other organizational entities within the Department of Defense.
