Soldiers assigned to The Old Guard, and living in the barracks, are assigned a PO Box as part of in processing. Occasionally, Soldiers need to send items ahead of their own arrival (ie: assignment from OCONUS). In this case use the following address:
3d US Infantry Regiment (The Old Guard)
Attn: Regiment S1 - Incoming Soldier
201 Jackson Ave.
Fort Myer, VA 22211