Player Embed Code: Download Embed Share DOD Officials Address Turkey Accepting Russian Defense System Defense.gov July 17, 2019 | 26:53 Undersecretary of Defense for Acquisition and Sustainment Ellen M. Lord and Deputy Undersecretary of Defense for Policy David J. Trachtenberg take questions from reporters at the Pentagon concerning the Defense Department's response to Turkey accepting delivery of the Russian S-400 air and missile defense system, July 17, 2019.