Kwajalein Missile Range. The abbreviation for the post is actually USAKA (U.S. Army Kwajalein Atoll) - the Kwajalein Missile Range and Reagan Test Site are integral parts of it. It's located in the Marshall Islands.
The meaning of the abbreviation APO in West Virginia is Army Post Office or Air Force Post Office. This allows members of the military to receive their mail when overseas.
OK is the abbreviation used.
The army abbreviation for ARO stands for Army Research Office, this office serves the army as its basic and most important research facility available to the U.S. army.
Old Post Rd.
In the US, Regular Army is RA.
PS.
PO
PPS
MO i believe is the abbreviation that you are looking for.
RA
FPO = Fleet post office for Navy personel. Apo = Army post office for Army personel
GPO