Defense Testimony Defense Secretary Jim Mattis and Marine Corps Gen. Joe Dunford, chairman of the Joint Chiefs of Staff, provide testimony on the FY2018 Defense Budget Request before the Senate Appropriations Committee Defense subcommittee in Washington D.C., June 14, 2017. DoD photo by Navy Petty Officer 2nd Class Dominique A. Pineiro SHARE: Download: Full Size (1.12 MB) Credit: Dominique A. Pineiro VIRIN: 170614-D-PB383-002L.JPG Photo Gallery