Player Embed Code: Download Embed Share DOD Leaders Host Vice President for Ceremony at National 9/11 Pentagon Memorial Defense.gov Sept. 11, 2018 | 1:06 Defense Secretary James N. Mattis and Air Force Gen. Paul J. Selva, the vice chairman of the Joint Chiefs of Staff, host Vice President Mike Pence for a memorial commemoration ceremony at the National 9/11 Pentagon Memorial, Sept. 11, 2018.