Mattis Announces Defense Secretary James N. Mattis announces the new National Defense Strategy at the Paul H. Nitze School of Advanced International Studies, a division of the Johns Hopkins University based in Washington, Jan. 19, 2018. DoD photo by Navy Petty Officer 1st Class Kathryn E. Holm SHARE IMAGE: Download Image: Full Size (0.12 MB) Tags: SecDef Photo By: Petty Officer 1st Class Kathryn E. Holm VIRIN: 180119-D-SH953-0038.JPG Photo Gallery