Player Embed Code: Download Embed Share DOD Leaders Host Vice President for Ceremony at Pentagon's September 11th Memorial Defense.gov Sept. 11, 2018 | 59:15 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 Pentagon's September 11th Memorial, Sept. 11, 2018.