What do the APO, FPO and DPO of American mailing address mean?

FPO/APO also known as the United States Post Office, in international trade, when the goods are sent to foreign countries, it will involve the problem of FPO/APO. In many countries, especially in some countries in Africa and the Middle East, there is no situation in which mail is delivered to the door. In these countries, postal mailboxes have always been rented to receive mail. However, sellers who do foreign trade on a general transnational trade website do not need to hire a mailbox. Since the general seller is mainly sent by personal mail packets, there is no FPO/APO
However, FPO/APO, as a problem to be paid attention to in other countries, needs to be paid attention to. And the fpo/apo in the trade is said to be:
FPO = Army Post Office post office
Apo = Fleet Post Office fleet post office
Fpo/apo locations is an army mailbox address, a garrison site produced by USPS and DOD (US Defense Department).
In the United States, only USPS (US postal service) to send PO Box or APO/FPO address, that is to say only the postal mail can be sent APO/FPO address (including EMS, HKEMS, CN, HK, HK package package package, CN packet, SW packet)
UPS, Fedex, DHL, and TNT cannot send PO Box or APO/FPO addresses.
Fpo/apo can send ordinary mail (letters, postcards, prints) and small packages, international postbags
It is worth noting that in order to facilitate the sending and receiving of overseas mail by military personnel stationed overseas, the US postal service and the Ministry of defense negotiated an agreement called overseas military mail.
The address of the battlefield Post Office (APO/FPO) is divided into three military "states" and two equivalent "cities".
One, three military "states"
1.AA, representing the Armed Forces (the) Americas American military
2.AE, Armed Forces Europe for European military
3.AP, Armed Forces Pacific Pacific military
Two, two military "cities"
APO, Army Post Office military post office
FPO, representing the Fleet Post Office fleet post office
Based on this construction, a typical overseas military email address looks like the following:
By making all overseas military mail conform to the domestic mail processing plan, the USPS can easily use their advanced mail processing machines to categorized and process these overseas military mail, such as handling ordinary mail.
Diplomatic Post Office (DPO) diplomatic post office
Army/Air Force Post Office (APO) Army / Air Force post office
Fleet Post Office (FPO) fleet post office