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Updated November 23, 2022
Defense Primer: Personnel Tempo (PERSTEMPO)

As a result of the nation's extended involvement in
contingency operations around the globe over the past few
decades, some servicemembers have experienced
prolonged, recurrent, and stressful deployments. In
addition, preparation for deployments (e.g., training,
exercises, temporary duty assignments) can incur extended
working hours or frequent travel away from home station.
The pace of operations for individuals is commonly referred
to as personnel tempo (PERSTEMPO) and can affect
quality of life, work satisfaction, and overall morale for
members and their families.
Congress oversees the Department of Defense's (DOD's)
PERSTEMPO management, policies and programs. In
addition, congressional actions to authorize force size (i.e.,
end-strength) can affect the number of personnel available
for deployment. Appropriated funds for military pay and
benefits (including leave and morale programs) may
compensate troops for time spent away.
Background and Definitions
During the mid-1990s, though the nation was not engaged
in major conflict, a combination of force drawdowns and
increased deployments in support of peacetime missions
(e.g., peacekeeping and humanitarian operations) put stress
on servicemembers, particularly those in high-deploying
specialty units. A 1996 Government Accountability Office
(GAO) report found that DOD did not have consistent goals
or policies for managing personnel tempo (see Table 2).
Recognizing a need to more accurately measure the pace of
operations on military personnel, in 1999, Congress first
added a statutory definition for deployment, established
high-deployment thresholds (then defined as 182 days or
more out of the preceding 365 days), and required Secretary
of Defense (SECDEF) approval to exceed those thresholds
as part of the FY2000 National Defense Authorization Act
(NDAA; P.L. 106-65), This law also required the Under
Secretary of Defense for Personnel and Readiness to
develop standardized terminology and policies for operating
tempo (OPTEMPO) and personnel (PERSTEMPO), and to
track and report on these categories.
Shortly after the September 11, 2001, attacks, the SECDEF
suspended statutory high-deployment thresholds under the
waiver authority in law. However, under department policy
(DOD Instruction 1336.5), the Services continued to track
deployment days. As operations in Afghanistan and Iraq
intensified, many raised concerns that individuals within
certain military occupational specialties were experiencing
both lengthy and frequent deployments. While the
PERSTEMPO measures captured deployment duration,
they did not adequately capture the down time, or dwell
time, members had between deployments. In 2007, DOD
established deploy-to-dwell planning objectives, and in the
FY2012 (NDAA; P.L. 112-81), Congress established a

statutory definition of dwell time (see Table 2 for a timeline
of selected events).
Current definitions take into account a broad range of
activities that keep servicemembers away from home
(Table 1). Activities not included as deployment events,
include, for example, military duties extending beyond
normal working hours but conducted at the member's home
duty station, also known as permanent duty station.
Table I. Statutory Definitions and Thresholds
Term                       Definition
PERSTEMPO          The amount of time servicemembers are
engaged in their official duties at a
location or under circumstances that
make it infeasible for a member to
spend off-duty time in the housing in
which the member resides.
OPTEMPO             The rate at which units are involved in
all military activities, including
contingency operations, exercises, and
training deployments.
Deployed or in a   Any day on which, pursuant to orders,
deployment         the member is performing service in a
training exercise or operation at a
location or under circumstances that
make it impossible or infeasible for the
member to spend off-duty time in the
housing in which the member resides
when on garrison duty at the member's
permanent duty station or homeport.
Current high        One-year: 220 days deployed out of the
deployment          previous 365 days. Two-year: 400 days
thresholds*         deployed out of the previous 730.
Dwell time         The time a regular member of the
armed forces or unit spends at the
permanent duty station or home port
after returning from deployment, or the
amount of time a reservist remains at
the member's permanent duty station
after completing a deployment of 30
days or more in length
Sources: 10 U.S.C. §991 and 10 U.S.C. § 136(d).
Notes: Contingency operations are as defined in 10 U.S.C.
§ 101 (a)(I 3)(B). *High-deployment thresholds have been waived since
2001 under the SECDEF authority in 10 U.S.C. §991(d). According to
a November I, 2013, USD (P&R) policy memo, involuntary extension
of a deployment beyond 365 days requires SECDEF approval.

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