USAF E-4B 73-1676 as "MARS 01" arriving at Munich with Secretary of Defense Jim Mattis to attend 54th Munich Security Conference.

USAF E-4B 73-1676 as "MARS 01" arriving at Munich with Secretary of Defense Jim Mattis to attend 54th Munich Security Conference.

Afghan troops prepare for the arrival of U.S. Secretary of Defense James N. Mattis at the Afghan Presidential Office building, Kabul, Afghanistan, Sept. 7, 2018. Mattis met with Afghan and coalition members during the previously unannounced visit to the country. (DoD photo by Lisa Ferdinando) www.dvidshub.net/

President Donald Trump and First Lady Melania Trump place their hands over their hearts during TAPS at the 9/11 Observance Ceremony at the Pentagon in Washington, D.C., Sept. 11, 2017. During the Sept. 11, 2001, attacks, 184 people were killed at the Pentagon. (DOD photo by Navy Petty Officer 1st Class Dominique A. Pineiro)

Secretary of Defense Jim Mattis meets with Canada’s Minister of Defense Harjit Sajjan Feb. 6, 2017, at the Pentagon in Washington, D.C. (DOD photo by Air Force Tech. Sgt. Brigitte N. Brantley) www.dvidshub.net

U.S. Secretary of Defense Jim Mattis hosts a full honors parade prior to the North American Defense Ministerial May 22, 2017, at the Pentagon in Washington, D.C. From left to right on the reviewing stand are Canada’s Minister of Defense Harjit Sajjan, Mexico’s Secretary of National Defense Gen. Cienfuegos Zepedas and Mexico's Secretary of Navy Adm. Vidal Soberon. (DoD photo by Air Force Tech. Sgt. Brigitte N. Brantley) www.dvidshub.net

Secretary of State Rex Tillerson, U.S. Secretary of Defense Jim Mattis, Japanese Foreign Minister Taro Kono, and Japanese Defense Minister Itsunori Onodera shake hands at the opening of the U.S.-Japan Security Consultative Committee (“2+2”), at the U.S. Department of State in Washington, D.C., on August 17, 2017. [State Department Photo/ Public Domain]

Secretary of Defense Jim Mattis attends a sunset parade as the invited guest of honor by Commandant of the Marine Corps. Gen. Robert B. Neller and Commanding Officer of the Marine Barracks Washington Col. Tyler J. Zagursk at the Marine Barracks in Washington, D.C., June 30, 2017. (DoD photo by U.S. Army Sgt. Amber I. Smith)

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Secretary of Defense Jim Mattis greets President Donald Trump, Jan. 18, 2018, at the Pentagon in Washington, D.C. (DOD photo by U.S. Navy Petty Officer 1st Class Dominique A. Pineiro)

Marine One transits past the Washington Monument with President Donald Trump following a meeting at the Pentagon with Defense Secretary Jim Mattis in Washington, D.C., Jan. 18, 2018. (DOD photo by U.S. Navy Petty Officer 1st Class Dominique A. Pineiro)

SINGAPORE (June 2, 2017) - Defense Secretary Jim Mattis and Marine Corps Gen. Joe Dunford, chairman of the Joint Chiefs of Staff, meet with Singapore Prime Minister Lee Hsien Loong in Singapore. (DoD photo by Air Force Staff Sgt. Jette Carr) 170602-D-GY869-474

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USS Arizona survivor Lauren Bruner, who served as a fire controlman third class, meets with Marine Corps Gen. Joseph F. Dunford Jr., chairman of the Joint Chiefs of Staff, at the Pentagon in Washington, D.C., July 21, 2017. (DOD photo by U.S. Navy Petty Officer 2nd Class Dominique A. Pineiro)

Secretary of Defense Jim Mattis waits for the arrival of President Donald Trump and Vice President Mike Pence Jan. 18, 2018, at the Pentagon in Washington, D.C. (DOD photo by U.S. Navy Petty Officer 1st Class Dominique A. Pineiro)

Secretary of Defense Jim Mattis and Vice President Mike Pence listen to President Donald Trump deliver remarks to the press Jan. 18, 2018, at the Pentagon in Washington, D.C. (DOD photo by U.S. Navy Petty Officer 1st Class Dominique A. Pineiro)

President Donald Trump pauses during the 9/11 Observance Ceremony at the Pentagon in Washington, D.C., Sept. 11, 2017. During the Sept. 11, 2001, attacks, 184 people were killed at the Pentagon. To the left is first lady Melania Trump, and to the right are Secretary of Defense Jim Mattis and Chairman of the Joint Chiefs of Staff Gen. Joseph Dunford. (DOD photo by Navy Petty Officer 1st Class Dominique A. Pineiro)

U.S. Secretary of State Michael R. Pompeo poses for a photo with U.S. Secretary of Defense Jim Mattis, Indian Minister of External Affairs Sushma Swaraj and Indian Defense Minister Nirmala Sitharaman after the conclusion of the 2+2 Dialogue, in New Delhi, India, September 6, 2018.[State Department photo/ Public Domain]

President Donald Trump departs the Pentagon via Marine One in Washington, D.C., Jan. 18, 2018. (DOD photo by U.S. Navy Petty Officer 1st Class Dominique A. Pineiro)

President Donald Trump and First Lady Melania Trump reflect during a moment of silence at the 9/11 Observance Ceremony at the Pentagon in Washington, D.C., Sept. 11, 2017. During the Sept. 11, 2001, attacks, 184 people were killed at the Pentagon. (DOD photo by Navy Petty Officer 1st Class Dominique A. Pineiro)

President Donald Trump and Vice President Mike Pence arrive at the Pentagon in Washington, D.C., prior to a meeting of the National Security Council July 20, 2017. (DOD photo by U.S. Navy Petty Officer 2nd Class Dominique A. Pineiro)

TOKYO, Japan (Feb. 4, 2017) - Defense Secretary Jim Mattis shakes hands with Japanese Defense Minister Tomomi Inada before a meeting at the Defense Ministry in Tokyo. (DoD photo by Army Sgt. Amber I. Smith)

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President Donald Trump delivers remarks to the press Jan. 18, 2018, at the Pentagon in Washington, D.C. (DOD photo by U.S. Navy Petty Officer 1st Class Dominique A. Pineiro)

President Donald Trump, First Lady Melania Trump, Secretary of Defense Jim Mattis, and Chairman of the Joint Chiefs of Staff Gen. Joseph Dunford arrive at the 9/11 Observance Ceremony at the Pentagon in Washington, D.C., Sept. 11, 2017. During the Sept. 11, 2001, attacks, 184 people were killed at the Pentagon. (DOD photo by Navy Petty Officer 1st Class Dominique A. Pineiro)

USS Arizona survivor Donald Stratton, who served as a seaman first class, and his family meet with Marine Corps Gen. Joseph F. Dunford Jr., chairman of the Joint Chiefs of Staff, at the Pentagon in Washington, D.C., July 21, 2017. (DOD photo by U.S. Navy Petty Officer 2nd Class Dominique A. Pineiro)

U.S. Secretary of State Rex Tillerson and U.S. Secretary of Defense Jim Mattis speak with their Japanese counterparts, Taro Kono and Itsunori Onodera, before the start of the U.S.-Japan Security Consultative Committee (“2+2”), at the U.S. Department of State in Washington, D.C., on August 17, 2017. [State Department Photo/ Public Domain]

Secretary of Defense Jim Mattis speaks to President Donald Trump and Vice President Mike Pence July 20, 2017, at the Pentagon in Washington, D.C., following a meeting of the National Security Council. (DOD photo by U.S. Navy Petty Officer 2nd Class Dominique A. Pineiro)

President Donald Trump pauses during the 9/11 Observance Ceremony at the Pentagon in Washington, D.C., Sept. 11, 2017. During the Sept. 11, 2001, attacks, 184 people were killed at the Pentagon. To the left is first lady Melania Trump, and to the right are Secretary of Defense Jim Mattis and Chairman of the Joint Chiefs of Staff Gen. Joseph Dunford. (DOD photo by Navy Petty Officer 1st Class Dominique A. Pineiro)

Chairman of the Joint Chiefs of Staff Gen. Joseph Dunford speaks to Secretary of Defense Jim Mattis before the 9/11 Observance Ceremony at the Pentagon in Washington, D.C., Sept. 11, 2017. During the Sept. 11, 2001, attacks, 184 people were killed at the Pentagon. (DOD photo by Navy Petty Officer 1st Class Dominique A. Pineiro)

President Donald Trump delivers remarks to the press Jan. 18, 2018, at the Pentagon in Washington, D.C. (DOD photo by U.S. Navy Petty Officer 1st Class Dominique A. Pineiro)

A U.S. Soldier mans a weapon on a CH-47 Chinook helicopter carrying U.S. Secretary of Defense James N. Mattis in Kabul, Afghanistan, Sept. 7, 2018. Mattis met with Afghan and coalition members during the previously unannounced visit to the country. (DoD photo by Lisa Ferdinando) www.dvidshub.net/

President Donald Trump and First Lady Melania Trump reflect during a moment of silence at the 9/11 Observance Ceremony at the Pentagon in Washington, D.C., Sept. 11, 2017. During the Sept. 11, 2001, attacks, 184 people were killed at the Pentagon. (DOD photo by Navy Petty Officer 1st Class Dominique A. Pineiro)

Survivors from the USS Arizona meet with military leaders at the Pentagon in Washington, D.C., July 21, 2017. (DOD photo by U.S. Navy Petty Officer 2nd Class Dominique A. Pineiro)

President Donald Trump participate in a wreath laying ceremony during the 9/11 Observance Ceremony at the Pentagon in Washington, D.C., Sept. 11, 2017. During the Sept. 11, 2001, attacks, 184 people were killed at the Pentagon. (DOD photo by Navy Petty Officer 1st Class Dominique A. Pineiro)

Members of the Indonesian Special Forces hold a demonstration in honor of Defense Secretary James N. Mattis before Mattis met with Indonesia's Chief of Defense Marshal Hadi Tjahjanto in Jakarta, Indonesia on Jan. 24, 2018. (DoD photo by Army Sgt. Amber I. Smith)

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Chairman of the Joint Chiefs of Staff Gen. Joseph Dunford speaks to Secretary of Defense Jim Mattis before the 9/11 Observance Ceremony at the Pentagon in Washington, D.C., Sept. 11, 2017. During the Sept. 11, 2001, attacks, 184 people were killed at the Pentagon. (DOD photo by Navy Petty Officer 1st Class Dominique A. Pineiro)

President Donald Trump pauses during a wreath laying ceremony during the 9/11 Observance Ceremony at the Pentagon in Washington, D.C., Sept. 11, 2017. During the Sept. 11, 2001, attacks, 184 people were killed at the Pentagon. (DOD photo by Navy Petty Officer 1st Class Dominique A. Pineiro)

WASHINGTON (Aug. 17, 2017) - Defense Secretary Jim Mattis and Secretary of State Rex Tillerson conduct a news conference with Japanese Defense Minister Itsunori Onodera and Foreign Minister Taro Kono following security meetings at the State Department in Washington. (Photo by Brigitte N. Brantley) 170817-D-GO396-0239

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Chairman of the Joint Chiefs of Staff Gen. Joseph Dunford meets President Donald Trump before 9/11 Observance Ceremony at the Pentagon in Washington, D.C., Sept. 11, 2017. During the Sept. 11, 2001, attacks, 184 people were killed at the Pentagon. (DOD photo by Navy Petty Officer 1st Class Dominique A. Pineiro)

Secretary of Defense Jim Mattis, right, speaks with Rep. Kay Granger, House Appropriations Defense subcommittee Chairwoman, center, and U.S. Marine Corps Gen. Joseph F. Dunford, Jr., chairman of the Joint Chiefs of Staff, left, before a budget hearing with the House Appropriations defense subcommittee at Rayburn House Office Building, June 15, 2017 in Washington D.C. The hearing centered around the fiscal year 2018 defense budget. (DoD Photo by U.S. Army Sgt. James K. McCann)

Secretary of Defense Jim Mattis and Chairman of the Joint Chiefs of Staff Gen. Joseph Dunford honor the flag during 9/11 Observance Ceremony at the Pentagon in Washington, D.C., Sept. 11, 2017. During the Sept. 11, 2001, attacks, 184 people were killed at the Pentagon. (DOD photo by Navy Petty Officer 1st Class Dominique A. Pineiro)

Chairman of the Joint Chiefs of Staff Gen. Joseph Dunford delivers remarks during the 9/11 Observance Ceremony at the Pentagon in Washington, D.C., Sept. 11, 2017. During the Sept. 11, 2001, attacks, 184 people were killed at the Pentagon. (DOD photo by Navy Petty Officer 1st Class Dominique A. Pineiro)

President Donald Trump pauses during a wreath laying ceremony during the 9/11 Observance Ceremony at the Pentagon in Washington, D.C., Sept. 11, 2017. During the Sept. 11, 2001, attacks, 184 people were killed at the Pentagon. (DOD photo by Navy Petty Officer 1st Class Dominique A. Pineiro)

U.S. Secretary of State Michael R. Pompeo flanked by U.S. Secretary of Defense Jim Mattis, Indian Minister of External Affairs Sushma Swaraj and Indian Defense Minister Nirmala Sitharaman delivers closing remarks at the 2+2 Dialogue, in New Delhi, India, September 6, 2018. [State Department photo/ Public Domain]

Secretary of Defense Jim Mattis greets President Donald Trump and Vice President Mike Pence July 20, 2017, at the Pentagon in Washington, D.C., prior to a meeting of the National Security Council. (DOD photo by U.S. Navy Petty Officer 2nd Class Dominique A. Pineiro)

USS Arizona survivor Lauren Bruner, who served as a fire controlman third class, meets with Navy Adm. John Richardson, Chief of Naval Operations at the Pentagon in Washington, D.C., July 21, 2017. (DOD photo by U.S. Navy Petty Officer 2nd Class Dominique A. Pineiro)

Survivors from the USS Arizona meet with Secretary of Defense Jim Mattis, Marine Corps Gen. Joseph F. Dunford Jr., chairman of the Joint Chiefs of Staff, and Navy Adm. John Richardson, Chief of Naval Operations, at the Pentagon in Washington, D.C., July 21, 2017. (DOD photo by U.S. Navy Petty Officer 2nd Class Dominique A. Pineiro)

Secretary of Defense Jim Mattis, President Donald Trump and Vice President Mike Pence depart the Pentagon following a meeting of the National Security Council in Washington, D.C., July 20, 2017. (DOD photo by U.S. Navy Petty Officer 2nd Class Dominique A. Pineiro)

Secretary of Defense Jim Mattis walks out of the Pentagon to greet President Donald Trump and Vice President Mike Pence July 20, 2017 in Washington, D.C., prior to a meeting of the National Security Council. (DOD photo by U.S. Navy Petty Officer 2nd Class Dominique A. Pineiro)

Chairman of the Joint Chiefs of Staff Gen. Joseph Dunford delivers remarks during the 9/11 Observance Ceremony at the Pentagon in Washington, D.C., Sept. 11, 2017. During the Sept. 11, 2001, attacks, 184 people were killed at the Pentagon. (DOD photo by Navy Petty Officer 1st Class Dominique A. Pineiro)

Department of Defense senior leaders attend the 9/11 Observance Ceremony at the Pentagon in Washington, D.C., Sept. 11, 2017. During the Sept. 11, 2001, attacks, 184 people were killed at the Pentagon. (DOD photo by Navy Petty Officer 1st Class Dominique A. Pineiro)

Secretary of Defense Jim Mattis speaks with Under Secretary of Defense (Comptroller) David L. Norquist before a budget hearing with the House Appropriations defense subcommittee at Rayburn House Office Building, June 15, 2017 in Washington D.C. The hearing centered around the fiscal year 2018 defense budget. (DoD Photo by U.S. Army Sgt. James K. McCann)