Washington Testimony Defense Secretary James N. Mattis and Vice Chairman of the Joint Chiefs of Staff Air Force Gen. Paul J. Selva testify on the National Defense Strategy and the Nuclear Posture Review before the House Armed Services Committee in Washington, Feb. 6, 2018. DoD photo by Navy Petty Officer 1st Class Kathryn E. Holm SHARE IMAGE: Download Image: Full Size (0.71 MB) Tags: HASC, house armed services committee, Secretary of Defense , james mattis, JIm Mattis, Chaos, Kathryn Holm, Mass Communication Specialist Kathryn E. Holm, Gen. Paul J. Selva , Department of Defense, Photo, DoD, Defense Secretary , James N. Mattis, SecDef, Pentagon, Vice Chairman of the Joint Chiefs of Staff, MILITARY Photo By: Kathryn E. Holm VIRIN: 180206-D-SH953-0090.JPG Photo Gallery