The Wayback Machine - https://web.archive.org/web/20190603155529/https://postcalc.usps.com/CustomsForm

For APO/FPO/DPO destinations, choose United States (Domestic and APO/FPO/DPO Mail) and enter ZIP Codes and Weight.
For US Territories, Possessions, and Freely Associated States, choose United States (Domestic and APO/FPO/DPO Mail) and enter ZIP Codes and Weight.