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U.S. Secretary of Defense Mark Esper (1st L, front) and Chairman of the Joint Chiefs of Staff General Mark Milley (2nd L, front) arrive to testify at a House Armed Services Committee hearing on the Fiscal Year 2021 National Defense Authorization Budget Request from the Department of Defense on Capitol Hill in Washington D.C., the United States, on Feb. 26, 2020. (Photo by Ting Shen/Xinhua)