Provide Testimony Defense Secretary Jim Mattis tells senators on the Senate Appropriations Committee's defense subcommittee that President Donald J. Trump has assigned responsibility for determining the number of U.S. troops in Afghanistan to him. DoD photo by Navy Petty Officer 2nd Class Dominique A. Pineiro SHARE IMAGE: Download Image: Full Size (1.41 MB) Tags: Joint Chief of Staff, JIm Mattis, SecDef, Chairman, Joe Dunford, MARINE CORPS, MARINES Photo By: Petty Officer 2nd Class Dominique A. Pineiro VIRIN: 170614-D-PB383-009.JPG Photo Gallery