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The Assistant Secretary of Defense for Energy, Installations, and Environment (ASD(EI&E)), concurrently the Chief Sustainability Officer, and formerly known as the Deputy Under Secretary of Defense for Installations and Environment (DUSD(I&E)), provides management and oversight of military installations worldwide and manages environmental, safety, and occupational health programs for the Department of Defense (DoD). DoD's installations cover some 29,000,000 acres (120,000 km²), with 539,000 buildings and structures valued at more than $700 billion. The responsibilities of the ASD(EI&E) include the development of installation capabilities, programs, and budgets; installation-energy programs and policy; base realignment and closure; privatization of military housing and utilities; and integration of environmental needs into the weapons acquisition process. The ASD(EI&E) is also responsible for environmental management, safety and occupational health; environmental restoration at active and closing bases; conservation of natural and cultural resources; pollution prevention; environmental research and technology; fire protection; and explosives safety. The ASD(EI&E) reports to the Under Secretary of Defense for Acquisition and Sustainment, and is a part of the Office of the Secretary of Defense.

Assistant Secretary of Defense for Energy, Installations, and Environment
Seal of the Assistant Secretary of Defense for Energy, Installations, and Environment
Flag of an Assistant Secretary of Defense
Incumbent Robert E. Thompson (acting) since January 22, 2025
Office of the Secretary of Defense
Style	The Honorable (formal address in writing)
Reports to	Under Secretary of Defense for Acquisition and Sustainment
Appointer	The President with the advice and consent of the Senate
Term length	No fixed term
Formation	February 10, 2022

History

Responsibility over installations and environmental affairs at the Defense Department was spread out across a variety of positions over time. Oversight for installations has been lumped together in the past with manpower, acquisition, and logistics functions (see, for example, the history of the Assistant Secretary of Defense for Logistics and Materiel Readiness and the Assistant Secretary of Defense for Force Management Policy). For a brief period in the mid-1990s, the Assistant Secretary of Defense for Economic Security had oversight for installations and the base realignment and closure (BRAC) program, in addition to DoD policy in the areas of industrial affairs, dual-use technology, international cooperation programs, and community economic adjustment. On April 5, 1996, the DoD nullified Defense Directive 5134.7 (signed August 21, 1995), thereby abolishing the ASD(Economic Security) while noting that this position has served the "purpose for which it was intended and is no longer required." Responsibility for installations then migrated to the Deputy Under Secretary of Defense for Installations.

Oversight for environmental affairs was linked together with health affairs for many years (see, for example, the Assistant Secretary of Defense for Health Affairs). In 2001, the responsibilities for installation and environment functions were merged into a single office. This office is not one of the five Principal Deputy Under Secretaries of Defense authorized by law, as articulated in the National Defense Authorization Act of 2010. Thus, DoD is statutorily obligated to re-designate this office in the near future, similar to the recent re-designation of the Deputy Under Secretaries of Defense within the Under Secretary of Defense for Personnel and Readiness.

As part of a reorganization on February 1, 2018, the ASD(EI&E) was abolished and combined with the Assistant Secretary of Defense for Logistics and Materiel Readiness to form a new Assistant Secretary of Defense for Sustainment. The ASD(EI&E) was reestablished on February 10, 2022.

Officeholders

The table below includes both the various titles of this post over time, as well as all the holders of those offices.

Deputy Under Secretaries of Defense (Installations and Environment)
Name	Tenure	SecDef(s) served under	President(s) served under
Responsibility for Installations
Director of Installations
Frank Creedon	August 25, 1952 - June 29, 1953	Robert A. Lovett Charles E. Wilson	Harry Truman Dwight Eisenhower
Assistant Secretary of Defense (Properties and Installations)
Franklin G. Floete	August 3, 1953 - March 4, 1956	Charles E. Wilson	Dwight Eisenhower
Floyd S. Bryant	May 2, 1956 - January 20, 1961	Charles E. Wilson Neil H. McElroy Thomas S. Gates	Dwight Eisenhower
Assistant Secretary of Defense (Installations and Logistics)
Thomas D. Morris	January 29, 1961 - December 11, 1964	Robert S. McNamara	John F. Kennedy Lyndon Johnson
Paul R. Ignatius	December 23, 1964 - August 31, 1967	Robert S. McNamara	Lyndon Johnson
Thomas D. Morris	September 1, 1967 - February 1, 1969	Robert S. McNamara Clark M. Clifford	Lyndon Johnson
Barry J. Shillito	February 1, 1969 - February 1, 1973	Melvin R. Laird	Richard Nixon
Arthur I. Mendolia	June 21, 1973 - March 31, 1975	James R. Schlesinger	Richard Nixon Gerald Ford
John J. Bennett (Acting)	April 1, 1975 - February 9, 1976	James R. Schlesinger Donald H. Rumsfeld	Gerald Ford
Frank A. Shrontz	February 10, 1976 - January 19, 1977	Donald H. Rumsfeld	Gerald Ford
Assistant Secretary of Defense (Manpower, Installations, and Logistics)
Lawrence J. Korb	January 12, 1984 - July 5, 1985	Caspar W. Weinberger	Ronald Reagan
Assistant Secretary of Defense (Development and Support)
James P. Wade	August 6, 1984 - July 5, 1985	Caspar W. Weinberger	Ronald Reagan
Assistant Secretary of Defense (Acquisition and Logistics)
James P. Wade	July 5, 1985 - November 3, 1986	Caspar W. Weinberger	Ronald Reagan
Robert B. Costello	March 13, 1987 - April 15, 1987	Caspar W. Weinberger	Ronald Reagan
Assistant Secretary of Defense (Production and Logistics)
Robert B. Costello	April 15, 1987 - December 17, 1987	Caspar W. Weinberger Frank C. Carlucci III	Ronald Reagan
Jack Katzen	March 28, 1988 - January 8, 1990	Frank C. Carlucci III William H. Taft IV (Acting) Richard B. Cheney	Ronald Reagan George H. W. Bush
Colin R. McMillan	March 5, 1990 - December 11, 1992	Richard B. Cheney	George H. W. Bush
Assistant Secretary of Defense (Economic Security)
Joshua Gotbaum	May 20, 1994 - December 25, 1995	William J. Perry	Bill Clinton
Deputy Under Secretary of Defense (Installations)
Randall A. Yim	1999 - 2001	William S. Cohen	Bill Clinton
Responsibility for Environment
Assistant Secretary of Defense (Health and Environment)
Dr. Louis M. Rousselot	July 22, 1970 - July 1, 1971	Melvin R. Laird	Richard Nixon
Dr. Richard S. Wilbur	July 27, 1971 - September 1, 1973	Melvin R. Laird Elliot L. Richardson James R. Schlesinger	Richard Nixon
Dr. James R. Cowan	February 19, 1974 - March 1, 1976	James R. Schlesinger Donald H. Rumsfeld	Richard Nixon Gerald Ford
Vernon McKenzie (Acting)	March 2, 1976 - March 8, 1976	Donald H. Rumsfeld	Gerald Ford
Deputy Undersecretary of Defense for Environmental Security
Sherri W. Goodman	1993 - 2001	Leslie Aspin Jr. William J. Perry William S. Cohen	Bill Clinton
Merged Responsibilities
Deputy Under Secretary of Defense (Installations and Environment)
Raymond F. DuBois	April 2001 - October 31, 2004	Donald H. Rumsfeld	George W. Bush
Philip W. Grone	November 1, 2004 - February 2008	Donald H. Rumsfeld Robert M. Gates	George W. Bush
Wayne Arny	February 2008 - July 2009	Robert M. Gates	George W. Bush Barack Obama
Dr. Dorothy Robyn	July 15, 2009 - September 2012	Robert M. Gates Leon Panetta	Barack Obama
John Conger (Acting)	September 2012 - December 2014	Leon Panetta Chuck Hagel	Barack Obama
Merged Responsibilities
Assistant Secretary of Defense (Energy, Installations and Environment)
John Conger (Performing the Duties of)	December 2014 - December 2015	Chuck Hagel Ashton Carter	Barack Obama
Pete Potochney (Principal Deputy Assistant Secretary of Defense for Sustainment)	December 2015 - August 1, 2017	Ashton Carter James Mattis	Barack Obama Donald Trump
Lucian Niemeyer	August 2, 2017 - July 2018	James Mattis	Donald Trump
Merged Responsibilities
Subsumed under Assistant Secretary of Defense (Sustainment) August 2018 - February 2022
Established Responsibilities
Assistant Secretary of Defense (Energy, Installations, and Environment)
Paul D. Cramer (Performing the Duties of)	February 10, 2022 – January 26, 2023	Lloyd Austin	Joe Biden
Brendan Owens	January 26, 2023 – January 20, 2025	Lloyd Austin	Joe Biden
Robert E. Thompson (acting)	January 22, 2025 - Present	Pete Hegseth	Donald Trump

References

"DUSD (I&E) - DUSD (I&E) Biography". Acq.osd.mil. April 15, 2011. Archived from the original on December 7, 2007. Retrieved July 15, 2012.
[1] Archived May 31, 2010, at the Wayback Machine
"Department of Defense Key Officials" (PDF). Historical Office, OSD. 2004. Archived from the original (PDF) on July 21, 2011. Retrieved February 1, 2011.
Title IX, Subtitle A, Section 906, Part b, "Archived copy" (PDF). Archived from the original (PDF) on February 3, 2011. Retrieved February 14, 2011.{{cite web}}: CS1 maint: archived copy as title (link)
Mehta, Aaron (February 2, 2018). "The Pentagon's acquisition office is gone. Here's what the next 120 days bring". Defense News. Retrieved February 22, 2018.
"Report to Congress: Restructuring the Department of Defense Acquisition, Technology and Logistics Organization and Chief Management Officer Organization" (PDF). August 1, 2017. Retrieved February 22, 2018.
"Statement of Mr. Paul Cramer Performing the Duties of Assistant Secretary of Defense (Energy, Installations & Environment) Before the House Committee on Armed Services Subcommittee on Readiness Department of Defense Energy, Installations & Environment Programs" (PDF). March 16, 2022. Retrieved September 27, 2022.
"Speech". Defense.gov. Archived from the original on October 14, 2012. Retrieved July 15, 2012.
Wynne, Michael W. (2005). "Subject: Deputy Under Secretary of Defense for Installations and Environment". Defense AT&L.
"News Release: Senior Executive Service Appointments and Reassignments". Defense.gov. March 12, 2009. Archived from the original on October 14, 2012. Retrieved July 15, 2012.
"Dorothy Robyn is GSA's pick as Public Buildings Service commissioner". washingtonpost.com. September 4, 2012. Retrieved November 27, 2012.
"DUSD(I&E) Biography". www.acq.osd.mil. September 21, 2012. Archived from the original on December 7, 2007. Retrieved November 27, 2012.
"New Year Ushers in New Installations, Energy Organization at Pentagon". www.defensecommunities.org/. January 11, 2015. Archived from the original on April 2, 2015. Retrieved March 3, 2015.
"I&E Featured News ANNOUNCEMENT". www.acq.osd.mil. December 20, 2014. Archived from the original on March 8, 2015. Retrieved March 3, 2015.
"Principal Deputy Under Secretary of Defense (Comptroller)". www.defense.gov/. Retrieved September 24, 2016.
"Mr. Peter Potochney Principal Deputy Assistant Secretary of Defense for Sustainment". Retrieved September 28, 2022.
"Trump picks Army official for sustainment job; intel nominee coming soon". www.defensenews.com/. February 25, 2020. Retrieved September 27, 2022.
"New Navy secretary, 7 other DoD officials confirmed by Senate". DefenseNews.com/. August 1, 2017. Retrieved September 27, 2022.
"Paul D. Cramer Performing the Duties of Deputy Under Secretary of Defense for Acquisition and Sustainment and Performing the Duties of Assistant Secretary of Defense for Energy, Installations, and Environment". Retrieved September 27, 2022.

[1] "DUSD (I&E) - DUSD (I&E) Biography". Acq.osd.mil. April 15, 2011. Archived from the original on December 7, 2007. Retrieved July 15, 2012.

[2] [1] Archived May 31, 2010, at the Wayback Machine

[multiple-3] "Department of Defense Key Officials" (PDF). Historical Office, OSD. 2004. Archived from the original (PDF) on July 21, 2011. Retrieved February 1, 2011.

[4] Title IX, Subtitle A, Section 906, Part b, "Archived copy" (PDF). Archived from the original (PDF) on February 3, 2011. Retrieved February 14, 2011.{{cite web}}: CS1 maint: archived copy as title (link)

[:0-5] Mehta, Aaron (February 2, 2018). "The Pentagon's acquisition office is gone. Here's what the next 120 days bring". Defense News. Retrieved February 22, 2018.

[:2-6] "Report to Congress: Restructuring the Department of Defense Acquisition, Technology and Logistics Organization and Chief Management Officer Organization" (PDF). August 1, 2017. Retrieved February 22, 2018.

[docs.house.gov-7] "Statement of Mr. Paul Cramer Performing the Duties of Assistant Secretary of Defense (Energy, Installations & Environment) Before the House Committee on Armed Services Subcommittee on Readiness Department of Defense Energy, Installations & Environment Programs" (PDF). March 16, 2022. Retrieved September 27, 2022.

[8] "Speech". Defense.gov. Archived from the original on October 14, 2012. Retrieved July 15, 2012.

[9] Wynne, Michael W. (2005). "Subject: Deputy Under Secretary of Defense for Installations and Environment". Defense AT&L.

[10] "News Release: Senior Executive Service Appointments and Reassignments". Defense.gov. March 12, 2009. Archived from the original on October 14, 2012. Retrieved July 15, 2012.

[11] "Dorothy Robyn is GSA's pick as Public Buildings Service commissioner". washingtonpost.com. September 4, 2012. Retrieved November 27, 2012.

[12] "DUSD(I&E) Biography". www.acq.osd.mil. September 21, 2012. Archived from the original on December 7, 2007. Retrieved November 27, 2012.

[13] "New Year Ushers in New Installations, Energy Organization at Pentagon". www.defensecommunities.org/. January 11, 2015. Archived from the original on April 2, 2015. Retrieved March 3, 2015.

[14] "I&E Featured News ANNOUNCEMENT". www.acq.osd.mil. December 20, 2014. Archived from the original on March 8, 2015. Retrieved March 3, 2015.

[15] "Principal Deputy Under Secretary of Defense (Comptroller)". www.defense.gov/. Retrieved September 24, 2016.

[16] "Mr. Peter Potochney Principal Deputy Assistant Secretary of Defense for Sustainment". Retrieved September 28, 2022.

[17] "Trump picks Army official for sustainment job; intel nominee coming soon". www.defensenews.com/. February 25, 2020. Retrieved September 27, 2022.

[18] "New Navy secretary, 7 other DoD officials confirmed by Senate". DefenseNews.com/. August 1, 2017. Retrieved September 27, 2022.

[19] "Paul D. Cramer Performing the Duties of Deputy Under Secretary of Defense for Acquisition and Sustainment and Performing the Duties of Assistant Secretary of Defense for Energy, Installations, and Environment". Retrieved September 27, 2022.