Acting U.S. Secretary of Defense Patrick M. Shanahan meets with the Qatar Minister of State for Defence Affairs Khalid bin Mohammad Al Attiyah at the Pentagon in Washington, D.C., March 12, 2019. (DoD photo by U.S. Army Sgt. Amber I. Smith)

36th Commandant of the Marine Corps Gen. Joseph F. Dunford makes remarks during the U.S. Marine Corps passage of command ceremony held at Marine Barracks, in Washington, D.C., Sept. 24, 2015. Gen. Joseph F. Dunford relinquished command to Gen. Robert B. Neller. Gen. Dunford will take over as Chairman of the Joint Chiefs of Staff on Sept. 25, 2015. DoD photo by Army Staff Sgt. Sean K. Harp/Released

Gen. Martin E. Dempsey, chairman of the Joint Chiefs of Staff, talks with other combatant commanders at the National War College on Fort Lesley J. McNair during a strategic dialog meeting, May 8, 2014. The Secretary of Defense, Chairman of the Joint Chiefs of Staff and all U.S. combatant commanders are attending the dialog. DoD photo by Staff Sgt. Sean K. Harp

Deputy Secretary of Defense Patrick M. Shanahan meets with Israeli Director General Udi Adam at the Pentagon in Washington, D.C., Apr. 30, 2018. (DoD photo by U.S. Army Sgt. Amber I. Smith)

18th Chairman of the Joint Chiefs of Staff Gen. Martin E. Dempsey joined Secretary of Defense Chuck Hagel for a press briefing in the Pentagon Oct. 30, 2014. Topics addressed covered current military operations against ISIL and military action in the Ebola crisis in West Africa. DoD photo by Army Staff Sgt. Sean K. Harp/Released

18th Chairman of the Joint Chiefs of Staff Gen. Martin E. Dempsey joined Secretary of Defense Chuck Hagel for a press briefing in the Pentagon Oct. 30, 2014. Topics addressed covered current military operations against ISIL and military action in the Ebola crisis in West Africa. DoD photo by Army Staff Sgt. Sean K. Harp/Released

U.S. Acting Secretary of Defense Patrick M. Shanahan meets with Belgian Minister of Defence Didier Reynders at the Pentagon in Washington, D.C., Feb. 21, 2019. (DoD photo by U.S. Army Sgt. Amber I. Smith)

Service members from the U.S. Army, Marine Corps, Navy, Air Force and Coast Guard march in review past the official party, including Secretary of Defense Chuck Hagel, U.S. President Barack H. Obama, U.S. Vice President Joseph R. Biden Jr. and Chairman of the Joint Chiefs of Staff Gen. Martin E. Dempsey, during the Armed Forces Farewell Tribute in Honor of Hagel Jan. 28, 2015, in Conmy Hall on the Fort Myer portion of Joint Base Myer-Henderson Hall. Obama hosted the ceremony with co-hosts Biden and Dempsey. (Joint Base Myer-Henderson Hall PAO photo by Rachel Larue)

U.S. Navy Adm. Charles “Chas” A. Richard, commander of U.S. Strategic Command (USSTRATCOM), and his wife, Lisa, welcome U.S. Secretary of Defense Mark Esper and his wife, Leah, during their visit to USSTRATCOM at Offutt Air Force Base, Neb., Feb. 19, 2020. During his visit, Esper toured the command’s global operations center and participated in discussions with senior leaders and warfighters on strategic deterrence in the 21st century. (U.S. Air Force photo by Steve Cunningham)

Secretary of Defense Jim Mattis and Chairman of the Joint Chiefs of Staff Gen. Joseph Dunford meet Singapore's Prime Minister Lee Hsien Loong at the Istana in Singapore on June 2, 2017. (DOD photo by U.S. Air Force Staff Sgt. Jette Carr)

Service members from the U.S. Army, Marine Corps, Navy, Air Force and Coast Guard participate in the Armed Forces Farewell Tribute in Honor of Secretary of Defense Chuck Hagel Jan. 28, 2015, in Conmy Hall on the Fort Myer portion of Joint Base Myer-Henderson Hall. U.S. President Barack H. Obama hosted the ceremony with co-hosts Vice President of the U.S. Joseph R. Biden Jr. and Chairman of the Joint Chiefs of Staff Gen. Martin E. Dempsey. (Joint Base Myer-Henderson Hall PAO photo by Rachel Larue)

18th Chairman of the Joint Chiefs of Staff Gen. Martin E. Dempsey joined Secretary of Defense Chuck Hagel and guests to say farewell to outgoing Under Secretary of Defense (Comptroller)/Chief Financial Officer Robert Hale in the Pentagon Auditorium, July 7, 2014. DoD photo by SSG Sean K. Harp, USA

NANGAHAR PROVINCE, Afghanistan – As the sun heads toward the horizon, two UH-60 Black Hawks and a CH-47 Chinook prepare to land at Forward Operating Base Connolly to pick up Robert M. Gates, the Secretary of Defense, during a recent visit with troops at the small FOB in eastern Afghanistan’s Nangahar Province, Dec. 7. (Photo by U.S. Army Staff Sgt. Mark Burrell, 210th Mobile Public Affairs Detachment)

U.S. Navy Adm. Charles “Chas” A. Richard, commander of U.S. Strategic Command (USSTRATCOM), escorts Secretary of Defense Dr. Mark T. Esper into the USSTRATCOM Command and Control Facility at Offutt Air Force Base, Neb., Feb. 20, 2020. During his visit, Esper toured the command’s global operations center and participated in discussions with senior leaders and warfighters on strategic deterrence in the 21st century. (U.S. Air Force photo by Steve Cunningham)

Secretary of Defense Ashton B. Carter (left) and Marine Gen. Joseph F. Dunford, Chairman of the Joint Chiefs of Staff, attend the Armed Forces Full Honor Review Farewell Ceremony in Honor of Secretary of Defense Ashton B. Carter at Joint Base Myer-Henderson Hall's Conmy Hall Jan. 9, 2017. Photo by Francis Chung / JBM-HH PAO.

18th Chairman of the Joint Chiefs of Staff Gen. Martin E. Dempsey joined Secretary of Defense Chuck Hagel for a press briefing in the Pentagon Oct. 30, 2014. Topics addressed covered current military operations against ISIL and military action in the Ebola crisis in West Africa. DoD photo by Army Staff Sgt. Sean K. Harp/Released

U.S. Acting Secretary of Defense Patrick M. Shanahan meets with Belgian Minister of Defence Didier Reynders at the Pentagon in Washington, D.C., Feb. 21, 2019. (DoD photo by U.S. Army Sgt. Amber I. Smith)

Secretary of Defense Dr. Mark T. Esper and U.S. Army Gen. Mark A. Milley, chairman of the Joint Chiefs of Staff provide testimony to the House Armed Services Committee on Department of Defense authorities and roles related to civilian law inforcement in Washington D.C., July 9, 2020. (DOD photo by Chad J. McNeeley)

WASHINGTON (May 4, 2020 - DMA personnel along with ASDPA Mr. Jonathan Hoffman prep Secretary of Defense, Mark T. Esper, for Brookings Institution webinar, "A conversation with Secretary of Defense Mark T. Esper". (DoD photo by Marvin Lynchard) 200504-D-FW736-1012

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18th Chairman of the Joint Chiefs of Staff Gen. Martin E. Dempsey joined Secretary of Defense Chuck Hagel and guests to say farewell to outgoing Under Secretary of Defense (Comptroller)/Chief Financial Officer Robert Hale in the Pentagon Auditorium, July 7, 2014. DoD photo by SSG Sean K. Harp, USA

Acting U.S. Secretary of Defense Patrick M. Shanahan meets with the Austrian Minister of Defense Mario Kunasek at the Pentagon in Washington, D.C., April 10, 2019. (DoD photo by U.S. Army Sgt. Amber I. Smith)

Acting U.S. Secretary of Defense Patrick M. Shanahan meets with the North Atlantic Treaty Organization Secretary General Jens Stoltenberg at Pentagon, Washington, D.C., Jan. 28, 2019. (DoD photo by U.S. Army Sgt. Amber I. Smith)

18th Chairman of the Joint Chiefs of Staff Gen. Martin E. Dempsey joined Secretary of Defense Chuck Hagel and Under Secretary of Defense (Comptroller)/Chief Financial Officer Robert Hale to testify before the Senate Subcommittee on Department of Defense to examine proposed budget estimates for fiscal year 2015 for the Department of Defense, Jun. 18, 2014. DoD photo by SSG Sean K. Harp, USA

U.S. Acting Secretary of Defense Patrick M. Shanahan greets the children during Take Our Daughters and Sons to Work Day, at the Pentagon, Washington, D.C., April 25, 2019. (DoD photo by Lisa Ferdinando)

OSAN AIR BASE, South Korea (June 2, 2019) - U.S. Army Chinook helicopter crews fly from Osan Air Base to Seoul, South Korea, in support of the visit of U.S. Acting Secretary of Defense Patrick M. Shanahan, June 2, 2019. (DoD photo by Lisa Ferdinando) 190602-D-BN624-0556

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Deputy Secretary of Defense Patrick M. Shanahan and Under Secretary of Defense for Acquisition, Technology and Logistics, Ellen M. Lord, observe the National Anthem before a ceremony for the David Packard Excellence in Acquisitions Awards at the Pentagon in Washington, D.C., on Feb. 6, 2018. (DoD photo by Army Sgt. Amber I. Smith)

Acting U.S. Secretary of Defense Patrick M. Shanahan meets with Greek Minister of Defence Evangelos Apostolakis during a visit to the Pentagon in Washington, D.C., June 7, 2019. (DoD photo by U.S. Army Sgt. Amber I. Smith)

U.S. Secretary of Defense Dr. Mark T. Esper presents 94-year-old U.S. Army Sgt. Herman Zeitchik, with a certificate, during his visit to the Pentagon, Aug. 29, 2019. (DOD photo by U.S. Navy Petty Officer 1st Class Dominique A. Pineiro)

18th Chairman of the Joint Chiefs of Staff Army Gen. Martin E. Dempsey talks with Secretary of Defense Chuck Hagel at the National War College on Fort Lesley J. McNair during a strategic dialog meeting, May 8, 2014. The Secretary of Defense, Chairman of the Joint Chiefs of Staff, and all U.S. combatant commanders are attending the dialog. DoD photo by Mass Communication Specialist 1st Class Daniel Hinton

Deputy Secretary of Defense Bob Work speaks at the Aerospace Industries Association reception June 18, 2017, in Paris, France. The AIA, with more than 325 major aerospace and defense companies and their suppliers as members, is a trade association representing the U.S. aerospace and defense industry. (DOD photo by U.S. Air Force Tech. Sgt. Brigitte N. Brantley)

Deputy Secretary of Defense Pat Shanahan hosts an enhanced honor cordon for Bosnia and Herzegovina's Minister of Defense Marina Pendes at the Pentagon in Washington, D.C., Sept. 12, 2017. (DOD photo by Air Force Tech. Sgt. Brigitte N. Brantley)

18th Chairman of the Joint Chiefs of Staff Gen. Martin E. Dempsey joined Secretary of Defense Chuck Hagel for a press briefing in the Pentagon Oct. 30, 2014. Topics addressed covered current military operations against ISIL and military action in the Ebola crisis in West Africa. DoD photo by Army Staff Sgt. Sean K. Harp/Released

18th Chairman of the Joint Chiefs of Staff Gen. Martin E. Dempsey joined Secretary of Defense Chuck Hagel for a press briefing in the Pentagon Oct. 30, 2014. Topics addressed covered current military operations against ISIL and military action in the Ebola crisis in West Africa. DoD photo by Army Staff Sgt. Sean K. Harp/Released

Secretary of Defense, Dr. Mark T. Esper, Vice Chairman of the Joint Chiefs of Staff Air Force Gen. John E. Hyten, and Air Force Gen. Tod D. Wolters, commander, U.S. European Command, brief the media on the European Strategic Force Posture Review, July 29, 2020. (DoD Photo by Chad J. McNeeley)

Deputy Secretary of Defense Pat Shanahan meets with students at The Judge Advocate General's Legal Center and School Sept. 25, 2017, at the University of Virginia in Charlottesville, Va. The school provides legal education, strategic planning, and collection and integration of lessons learned to the DOD legal community. (DOD photo by Air Force Tech. Sgt. Brigitte N. Brantley)

U.S. Acting Secretary of Defense Patrick M. Shanahan meets with Belgian Minister of Defence Didier Reynders at the Pentagon in Washington, D.C., Feb. 21, 2019. (DoD photo by U.S. Army Sgt. Amber I. Smith)

U.S. Acting Secretary of Defense Patrick M. Shanahan meets with Belgian Minister of Defence Didier Reynders at the Pentagon in Washington, D.C., Feb. 21, 2019. (DoD photo by U.S. Army Sgt. Amber I. Smith)

Deputy Secretary of Defense Patrick M. Shanahan is the invited guest of honor by Assistant Commandant of the Marine Corps Gen. Glenn M. Walters during the Marine Barracks Washington sunset parade in Arlington, Va., May 11, 2018. (DoD photo by U.S. Army Sgt. Amber I. Smith)

Deputy Secretary of Defense Patrick M. Shanahan is the invited guest of honor by Assistant Commandant of the Marine Corps Gen. Glenn M. Walters during the Marine Barracks Washington sunset parade in Arlington, Va., May 11, 2018. (DoD photo by U.S. Army Sgt. Amber I. Smith)

18th Chairman of the Joint Chiefs of Staff Gen. Martin E. Dempsey joined Secretary of Defense Chuck Hagel for a press briefing in the Pentagon Oct. 30, 2014. Topics addressed covered current military operations against ISIL and military action in the Ebola crisis in West Africa. DoD photo by Army Staff Sgt. Sean K. Harp/Released

Commander of the troops and Commander of 3d U.S. Infantry Regiment (The Old Guard) Col. Johnny K. Davis, left, escorts Secretary of Defense Chuck Hagel during the Armed Forces Farewell Tribute in Honor of Secretary of Defense Chuck Hagel Jan. 28, 2015, in Conmy Hall on the Fort Myer portion of Joint Base Myer-Henderson Hall. U.S. President Barack H. Obama hosted the ceremony with co-hosts U.S Vice President Joseph R. Biden Jr. and Chairman of the Joint Chiefs of Staff Gen. Martin E. Dempsey. (Joint Base Myer-Henderson Hall PAO photo by Rachel Larue)

Deputy Secretary of Defense Pat Shanahan visits the stables of the Caisson Platoon, 1st Battalion, 3rd U.S. Infantry Regiment (Old Guard) during a visit to Joint Base Myer-Henderson Hall, Va., Aug. 14, 2017. The platoon cares for and rides the horses used in funerals at Arlington National Cemetery. (DOD photo by Air Force Tech. Sgt. Brigitte N. Brantley)

Deputy Secretary of Defense Pat Shanahan and his family visit the stables of the Caisson Platoon, 1st Battalion, 3rd U.S. Infantry Regiment (Old Guard) during a visit to Joint Base Myer-Henderson Hall, Va., Aug. 14, 2017. (DOD photo by Air Force Tech. Sgt. Brigitte N. Brantley)

U.S. Acting Secretary of Defense Patrick M. Shanahan hosts German Defense Minister Ursula von der Leyen, at the Pentagon, Washington, D.C., April 12, 2019. (DoD photo by Lisa Ferdinando)

Deputy Secretary of Defense Patrick M. Shanahan meets with Israeli Director General Udi Adam at the Pentagon in Washington, D.C., Apr. 30, 2018. (DoD photo by U.S. Army Sgt. Amber I. Smith)

Deputy Secretary of Defense Patrick M. Shanahan is the invited guest of honor by Assistant Commandant of the Marine Corps Gen. Glenn M. Walters during the Marine Barracks Washington sunset parade in Arlington, Va., May 11, 2018. (DoD photo by U.S. Army Sgt. Amber I. Smith)

From left, Secretary of Defense Chuck Hagel, U.S. President Barack H. Obama, U.S. Vice President Joseph R. Biden Jr. and Chairman of the Joint Chiefs of Staff Gen. Martin E. Dempsey watch as The Old Guard Fife and Drum Corps performs during the Armed Forces Farewell Tribute in Honor of Hagel Jan. 28, 2015, in Conmy Hall on the Fort Myer portion of Joint Base Myer-Henderson Hall Obama hosted the ceremony with co-hosts Biden Jr. and Dempsey. (Joint Base Myer-Henderson Hall PAO photo by Rachel Larue)