Player Embed Code: Download Embed Share OSD and DoDEA Hosts Webinar for Students and Survivors of 9/11 Defense.gov Sept. 9, 2021 | 44:35 The Office of the Secretary of Defense hosts a virtual webinar with Department of Defense Education Activity high school students and survivors of the 9/11 Pentagon attack. Guests include Tom Lassman, DOD senior historian, and 9/11 Pentagon survivors retired Navy Capt. Joseph Gradisher and Keith Walker.