How can I request an intra-theater/inter-theater transfer?

The S1 maybe busy, but this very thing is their JOB. Should be a 4187 and set of orders. This is basic 42A blocking and tackling type thing.
- processing 4187 personnel actions
- cutting personnel orders
- reassigning personnel inside the organization

I find it hard to believe that if the 1SG wants this to happen, that the S1 NCOIC doesn't make it happen unless the CSM said NO.
The other issue may be they are changing MACOMs and this would "restart their clock" by doing an across the street move.

Edit: AR614-30 Para 4-2 is the authority but doesn't outline "how". The Commander owning both units (from what you describe, same unit two separate locations). The constructive cost of the move is way under $1500 provided it's a barracks soldier. A couple Joe's, a TMP bongo truck in and afternoon can move a single Joe from Osan to Humphreys. It is more of a matter of the documents. Should just be a 4187 and a set of orders directing movement.

It will take the soldier longer to clear the barracks room than the move process should take.

Does the Soldier want to make this move or the Command? Is the Soldier on a 1 year tour or 2 year tour with family in country? The answers to these questions would determine what type of request would need to be processed, what type of order would be issued and who the approval authority would be. With it only being a 8 mile move, it probably could be approved locally.