It can be done, yes, but it's usually going to take a pretty good reason for it. I did it when I was at Fort Bragg, because the battalion I requested a transfer to was about to deploy to Afghanistan, and needed more medics. If it's something you want to do on mere whim alone, your transfer request isn't likely to be approved, unless you're some sort of dirtbag your Battalion Commander would rather dump on another unit than have to deal with.
FPO = Fleet post office for Navy personel. Apo = Army post office for Army personel
General Order One says "I will guard everything within the limits of my post and quit my post only when properly relieved."
It is when a soldier transfers from one unit or batallion to another within the same installation (military base).
U.S. Army installations are usually referred to as "posts." Air Force & Navy installations are referred to as "bases." Therefore, facilities within an Army post would be referred to as "Post Exchange", "Post Theater", etc. Facilities within a Naval or Air Force base would be referred to as "Base Exchange", "Base Theater", etc. Army posts often have "Fort" in the name, although other terms, including "Camp" are used ("Camp" is also used by the Marine Corps).
Army Post Office, Addresses for overseas locations
T. Lippiatt has written: 'Post-mobilization training of Army Reserve Component combat units' -- subject(s): Mobilization, Operational readiness, Reserves, United States, United States. Army
An Army installation is called a post. Base is used by the Air Force and Marine Corps.
The airport code for Henry Post Army Airfield is FSI.
Reenlist for that station, request a transfer through your chain of dommand, find a soldier of equal rank and the same MOS at the post you wish to transfer to and see if you can swap out with them. Nothing is guaranteed unless such a guarantee is made in writing, however.
Units inprocess redeployers within 2 duty days of their R-Day so redeployers can begin personnel recovery (post-deployment downtime and leave) as soon as possible.
In 1969 there was a Fire Base Apollo in IIICTZ manned by the 3rd Bde of the 1st Infantry Division, US Army. There was an out post apollo located on the ashau valley occupied by units from the 101st airbourne division from 1971 to february 1972.
If the SMA is on your post, you will know it. Either the entourage surrounding him or someone within sight is going to give that away. Otherwise, the rank insignia.