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ARLINGTON, Va. (Jan. 9, 2017) The U.S. Navy Ceremonial Guard assigned to Naval District Washington, D.C., stands in formation during Secretary of Defense Ash Carter's farewell ceremony at Joint Base Myer-Hehderson Hall, Va. (Official DoD photo by EJ Hersom/Released)

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)

Acting U.S. Secretary of Defense Patrick M. Shanahan and the Acting Assistant Secretary of Defense for International Security Affairs Kathryn Wheelbarger meet with the Minister of Defense of the Republic of North Macedonia Radmila Šekerinska at the Pentagon in Washington, D.C., March 6, 2019. (DoD photo by U.S. Army Sgt. Amber I. Smith)

Secretary of Defense Jim Mattis speaks with members of the U.S. Strategic Command during his visit to Offutt Air Force Base, Neb., Sept. 14, 2017. (DOD photo by U.S. Air Force Staff Sgt. Jette Carr)

YOKOTA AIR BASE, Japan (Aug. 7, 2019) - .S. Secretary of Defense Dr. Mark T. Esper, center, walks with U.S. Marine Corps Maj. Gen. Christopher J. Mahoney, United States Forces Japan deputy commander, left, and U.S. Air Force Col. Otis C. Jones, 374th Airlift Wing commander, right, prior to departing Yokota Air Base, Japan to continue his Pacific Tour, Aug. 7, 2019. Having been recently confirmed as SECDEF on July 23, 2019, this was Esper’s first trip to the region to reaffirm U.S. commitment with its partner nation of Japan. (U.S. Air Force photo by Senior Airman Matthew Gilmore) 190807-F-GA541-0191

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Deputy Secretary of Defense Patrick M. Shanahan swears in Robert Wilkie as the Under Secretary of Defense for Personnel and Readiness during a ceremony Dec. 20, 2017, at the Pentagon in Washington, D.C. In this role, he serves as principal advisor to the Secretary and Deputy Secretary of Defense for total force management as it relates to readiness; National Guard and Reserve component affairs; health affairs; training; and personnel requirements and management, including equal opportunity, morale, welfare, recreation, and the quality of life for military families. (DOD photo by Air Force Tech. Sgt. Brigitte N. Brantley)

Defense Secretary James Mattis, Marine Corps Gen. Joseph F. Dunford, Jr., chairman of the Joint Chiefs of Staff, and Army Command Sgt. Maj. John W. Troxell, senior enlisted advisor to the chairman of the Joint Chiefs of Staff, host Cooper Smith and his family during a visit at the Pentagon in Washington, D.C., April 2, 2018. (DOD photo by Navy Petty Officer 1st Class Dominique A. Pineiro)

Secretary of Defense Dr. Mark T. Esper is greeted by U.S. Navy Adm. Charles “Chas” A. Richard, commander of U.S. Strategic Command (USSTRATCOM), upon his arrival 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 Richard, other senior leaders and warfighters on strategic deterrence in the 21st century. (U.S. Air Force photo by Steve Cunningham)

Secretary of Defense Chuck Hagel gives remarks 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. 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)

Deputy Secretary of Defense hosts an enhanced honor cordon for acting Minister of National Defense for Afghanistan Lt. Gen. Tariq Shah Bahrami Nov. 20, 2017, at the Pentagon in Washington, D.C. (DOD photo by Air Force Tech. Sgt. Brigitte N. Brantley)

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)

210911-N-DD694-1036 ARLINGTON, Va. (Sept. 11, 2021) Members of the U.S. Navy Band Sea Chanters perform in a joint service chorus at the Pentagon 9/11 Observance Ceremony. The ceremony took place on the 20th Anniversary of the terrorist attack on the Pentagon which killed 184 people. (U.S. Navy photo by Musician 1st Class Jonathan Barnes/Released)

Members of the Air Fore Honor Guard stand at attention during the retirement ceremony for Air Force Chief of Staff Gen. Mark A. Welsh III at Andrews Air Force Base, Md. Welsh was commissioned as an Air Force officer in June 1976, and became chief of staff in August 2012. DoD Photo by Navy Petty Officer 2nd Class Dominique A. Pineiro

Army Gen. Mark A. Milley, chairman of the Joint Chiefs of Staff, speaks during a virtual town hall at the Pentagon, Sept. 24, 2020. Milley, joined by Secretary of Defense Mark T. Esper and Senior Enlisted Advisor to the Chairman (SEAC) Ramon "CZ" Colon-Lopez, answered questions asked by service members, their families, DOD civilians and the American public about the department’s COVID-19 response and diversity and inclusion. (DOD Photo by Navy Petty Officer 1st Class Carlos M. Vazquez II)

Members of a U.S. Marine Corps string quartet play during a formal dinner at the Carnegie Library in Washington, D.C., June 1, 2017. During the dinner, Deputy Secretary of Defense Bob Work hosted his counterparts and government officials from eight Nordic-Baltic countries in advance of a Nordic-Baltic Forum. (DOD photo by U.S. Air Force Tech. Sgt. Brigitte N. Brantley)

Acting U.S. Secretary of Defense Patrick M. Shanahan is welcomed to the South Korean Ministry of Defense with an honor guard arrival hosted by Minister of National Defense Jeong Kyeong-doo, Seoul, South Korea, June 3, 2019. (DoD photo by Lisa Ferdinando)

U.S. Navy Band members wait for the start of the Naval Academy's 2019 graduation and commissioning ceremony in Annapolis, Md., May 24, 2019. (DoD photo by U.S. Army Sgt. Amber I. Smith)

Deputy Secretary of Defense Patrick M. Shanahan meets with the Republic of Korea’s Vice Defense Minister Suh Choo-Suk at the Pentagon in Washington, D.C., Jan. 19, 2018. (DoD photo by U.S. Army Sgt. Amber I. Smith)

Senior Enlisted Advisor to the Chairman (SEAC) Ramon "CZ" Colon-Lopez speaks during a virtual town hall at the Pentagon, Sept. 24, 2020. Colon-Lopez, joined by Secretary of Defense Mark T. Esper and Army Gen. Mark A. Milley, chairman of the Joint Chiefs of Staff, answered questions asked by service members, their families, DOD civilians and the American public about the department’s COVID-19 response and diversity and inclusion. (DOD Photo by Navy Petty Officer 1st Class Carlos M. Vazquez II)

Members of the U.S. Army Chorus sing during a formal dinner at the Carnegie Library in Washington, D.C., June 1, 2017. During the dinner, Deputy Secretary of Defense Bob Work hosted his counterparts and government officials from eight Nordic-Baltic countries in advance of a Nordic-Baltic Forum. (DOD photo by U.S. Air Force Tech. Sgt. Brigitte N. Brantley)

Deputy Secretary of Defense Pat Shanahan learns about the mission at Naval Air Station Whidbey Island, Wash., Nov. 15, 2017. (DOD photo by U.S. Air Force Tech. Sgt. Brigitte N. Brantley)

Chairman of the Joint Chiefs of Staff Martin E. Dempsey gives remarks at a farewell ceremony for Under Secretary of Defense for Policy Dr. James N. Miller at the Pentagon, Jan. 7, 2014. DoD photo by Mass Communication Specialist 1st Class Daniel Hinton.

210911-N-DD694-1049 ARLINGTON, Va. (Sept. 11, 2021) A Marine Band trumpeter sounds Taps at the Pentagon 9/11 Observance Ceremony. The ceremony took place on the 20th Anniversary of the terrorist attack on the Pentagon which killed 184 people. (U.S. Navy photo by Musician 1st Class Jonathan Barnes/Released)

Members of a U.S. military honor guard wait in the rain to welcome Israeli Defense Minister Ehud Barak to the Pentagon Feb. 29, 2012. (DoD photo by Mass Communication Specialist 1st Class Chad J. McNeeley, U.S. Navy/Released)

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)

A Korean War veteran speaks to leaders before a flag presentation by the U.S. Vice President Michael Pence to the Korean War Veterans Memorial Foundation at the Korean War Memorial in Washington, D.C., Sep. 20, 2018. The vice president presented a flag to the foundation that was among the flags that wrapped the cases of some 55 remains of fallen Americans from the Korean War. (DoD photo illustration by Army Sgt. Amber I. Smith)

SINGAPORE, Singapore (July 27, 2021) - )Secretary of Defense Lloyd J. Austin III participates in a welcome ceremony at Singapore's Ministry of Defense, July 27, 2021. Austin met with Defense Minister Dr. Ng Eng Hen and discussed the close military relationship between the two nations. (Photo by Chad J. McNeeley, DOD) 210727-D-TT977-0014

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Deputy Secretary of Defense Pat Shanahan meets with Kazakhstan's Lt. Gen. Talgat Mukhtarov, deputy miniter of defense, during the United Nations Peacekeeping Defense Ministerial Nov. 15, 2017, in Vancouver, Canada. (DOD photo by U.S. Air Force Tech. Sgt. Brigitte N. Brantley)

18th Chairman of the Joint Chiefs of Staff Gen. Martin E. Dempsey joined Secretary of Defense Ash Carter brief the media at the Pentagon, April 16, 2015. DoD photo by Army Staff Sgt. Sean K. Harp/Released

Deputy Secretary of Defense Bob Work visits with exhbitors at the Paris Air Show June 19, 2017, in Paris, France. (DOD photo by U.S. Air Force Tech. Sgt. Brigitte N. Brantley)

Deputy Secretary of Defense Pat Shanahan learns about the mission at Naval Air Station Whidbey Island, Wash., Nov. 15, 2017. (DOD photo by U.S. Air Force Tech. Sgt. Brigitte N. Brantley)

18th Chairman of the Joint Chiefs of Staff Gen. Martin E. Dempsey joined Secretary of Defense Hon. Chuck Hagel for testimony before the House Armed Services Committee on Capitol Hill, Nov. 13, 2014. Gen. Dempsey and Secretary Hagel's testimony addressed questions concerning the Obama administration's commitment of an additional 1,500 troops and $5.6 billion to the military campaign against the Islamic State terrorist group ISIL. DoD photo by Army Staff Sgt. Sean K. Harp/Released

Secretary of Defense Chuck Hagel gives remarks 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. 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 Hon. Chuck Hagel at to address the media in the Pentagon Briefing Room, Sept. 26, 2014. DoD photo by Army Staff Sgt. Sean K. Harp/Released

The Honorable Ashton B. Carter, 25th Secretary of Defense, speaks briefly with 3rd U.S. Infantry Regiment (The Old Guard) Commander Army Col. Jason T. Garkey, after inspecting the Armed Forces Honor Guard during his Armed Forces Farewell Tribute in honor of the 25th Secretary of Defense at Conmy Hall, Joint Base Myer-Henderson Hall, Va., Jan. 9, 2017. (DoD Photo by U.S. Army Sgt. James K. McCann)

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)

Acting U.S. Secretary of Defense Patrick M. Shanahan speaks to the Vietnam War Commemorative Advisory Committee during their farewell ceremony at the Pentagon in Washington, D.C., May 10, 2019. Shanahan also pinned certain members with the Distinguished Public Service Award for their work while on the committee. (DoD photo by 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)

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)

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 hosts an enhanced honor cordon for acting Minister of National Defense for Afghanistan Lt. Gen. Tariq Shah Bahrami Nov. 20, 2017, at the Pentagon in Washington, D.C. (DOD photo by Air Force Tech. Sgt. Brigitte N. Brantley)

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)

Defense Secretary Ash Carter and Marine Gen. Joseph F. Dunford, chairman of the Joint Chiefs of Staff, provide testimony to the Senate Armed Services Committee at the Dirksen Senate Office Building in Washington D.C. Sept. 22, 2016. DoD Photo by Navy Petty Officer 2nd Class Dominique A. Pineiro

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)

Senator Lindsey Graham addresses U.S. Marine Gen. Joseph F. Dunford Jr., chairman of the Joint Chiefs of Staff, Secretary of Defense Ash Carter, and Under Secretary of Defense Mike McCord during the U.S. Senate Committee on Appropriations Department of Defense fiscal year 2017 budget hearing, on Capitol Hill, April 27, 2016. DoD photo by Army Staff Sgt. Sean K. Harp/Released