A Fleet Post Office is created to deliver mail to military vessels away from their home country. The Fleet Post Office in the United States is jointly ran by the USPS and the Department of Defense.

Description from the US Embassy in Jakarta

The Fleet Post Office (FPO) located in the Chancery Compound, American Embassy Jakarta, is a U.S. Navy component of the Military Postal Service (MPS), which includes Navy, Marine Corps, Army and Air Force postal operations. The MPS is an extension of the United States Postal Service (USPS), and operates under an agreement between the Department of Defense (DOD), USPS, and host countries. The Military Postal Service Agency (MPSA) is responsible for the direction and administration of the MPS. MPSA headquarters are located in Alexandria, VA. The mission of the MPS is to provide postal service to DOD agencies in support of DOD missions. The ultimate goal of the MPS is to provide a level of service to authorized users equal to that provided by the USPS to the civilian population of the U.S. The Chief of Naval Operations (CNO) directs the MPS within the Department of the Navy (DON). Commander, Naval Supply Systems Command (COMNAVSUPSYSCOM) coordinates the MPS within the DON. Each Fleet Commander in Chief is directly responsible for the administration, operation, and monitoring of the MPS within their respective theatre, therefore, Commander in Chief, U.S. Pacific Fleet (CINPACFLT), is responsible for the administration, operation, and monitoring of Pacific Fleet FPO’s. The NRCC DET Jakarta FPO is a detachment of U.S. Naval Regional Contracting Center (NRCC), Singapore, and is under the operational and administrative control of Commanding Officer, NRCC, Singapore, through the on site Detachment Officer In Charge (DET OIC). The FPO provides postal services comparable to those provided by full service U.S. Post Offices. It is staffed by one U.S. military DET OIC, 2 U.S. citizen, and 3 Foreign Service Nationals. Customer service hours are from 0900-1500 Monday through Friday, less American and Indonesian national holidays. For specific FPO Jakarta operation information, contact the FPO via Commercial Telephone: (62-21) 3435-9181/ 9183; Commercial Fax: (62-21) 386-2259; U.S. Mail: Postal Officer, American Embassy Jakarta, FPO AP 96520-8137; E-Mail: brotskirj@state.gov, or view the Intranet www.jakarta.gov under "Fleet Post Office".

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