APO stands for "Army Post Office," and is associated with Army or Air Force installations. FPO stands for "Fleet Post Office," and is associated with Navy installations and ships.
The only way to send an item to an APO or FPO address is to use the United States Postal Service.
Please be advised, the delivery estimate to ship to military addresses is a minimum of 30 days. Expedited shipping is not available when shipping to these addresses.