Sending a package to an overseas U.S. military base is relatively straightforward if you keep a few things in mind.
You also have the option of Armed Forces (AA) and Armed Forces (AP).
Here’s an example of a properly formatted APO address:
Name: PFC Jack Lyon
Address 1: 23rd Battalion
Address 2: Unit 1234, Box 56789
Country: United States
Zip/Postal Code: 96522-1215.