Nuclear Posture Briefing Deputy Defense Secretary Patrick M. Shanahan, center, Thomas A. Shannon Jr., left, the State Department's undersecretary for political affairs, and Deputy Energy Secretary Dan Brouillette brief reporters on the 2018 Nuclear Posture Review at the Pentagon, Feb. 2, 2018. DoD photo by Navy Petty Officer 1st Class Kathryn E. Holm SHARE: Download: Full Size (1.61 MB) Credit: Kathryn E. Holm VIRIN: 180202-D-SH953-0040C.JPG Photo Gallery