Mission Briefing Performing the duties of the deputy undersecretary of defense for policy, Mara E. Karlin virtually participates in the Mission Brief: The Next National Defense Strategy discussion, as part of the Center for a New American Security mission brief speaker series at the Pentagon, Dec. 9, 2021. SHARE IMAGE: Download Image: Full Size (2.35 MB) Photo By: Air Force Staff Sgt. Brittany A. Chase VIRIN: 211209-F-BM568-1031A.JPG Photo Gallery