Invitations for the secretary of defense must be submitted in writing on official letterhead. Invitations can be faxed to the secretary's scheduling office at (703) 571-8951, or they can be mailed to the address below. Your invitation should contain as much detail as possible, including information on any other VIPs who plan to attend.
Dr. Mark T. Esper
Secretary of Defense
1000 Defense Pentagon
Washington, DC 20301-1000
If you are trying to locate a senior defense official whose position within the DOD is pertinent to your event, you can find a listing of them, their titles and their offices on our biographies page: https://dod.defense.gov/About/Biographies/Senior-Defense-Officials/.
The mailing addresses for several of these officials can be found here: https://www.defense.gov/Contact/Mailing-Addresses/.