Defense Secretary Ash Carter testifies before the the Senate Armed Services Committee in Washington, Sept. 22, 2016. Carter was joined by Marine Corps Gen. Joe Dunford, chairman of the Joint Chiefs of Staff, and the two leaders discussed national security challenges, military operations and their concerns over the potential of an eigth continuing resolution heading into fiscal year 2017. DoD photo by Navy Petty Officer 2nd Class Dominique A. Pineiro