Each shipment to an APO/FPO/DPO needs the recipient's name, rank, and unit, and the APO/FPO/DPO address with the 9-digit ZIP Code™. Always include a return address. Mail and shipments must be addressed to a specific person; addressing to "Any Service Member" is no longer permitted.
To prevent mail from entering foreign mail networks, do not include city or country names in APO/FPO/DPO shipping addresses.
Here are properly addressed shipment examples:
Army/Air Post Office (APO)
PFC JOHN DOE
PSC 3 BOX 4120
APO AE 09021
Fleet Post Office (FPO)
SEAMAN JOSEPH SMITH
UNIT 100100 BOX 4120
FPO AP 96691
Diplomatic Post Office (DPO)
JOHN ADAMS
UNIT 8400 BOX 0000
DPO AE 09498-0048