Once you run out of fuel to fly flight with your fighters and not much need to port facilities. The excess enlisted and officers will be re-trained in Infantry tactics. Air Force and Naval commanders wouldn't like it. They don't have too like it.
Even in WWI the 4th US Infantry Division had a Marine Brigade assigned to it as one of it combat two combat Brigades.
So their is precedents, and these new acquired infantry would be used as replacement for the large part. With that said, the bulk of the Air Force newly trained infantry would go to Army units, with some going back to reinforce the remains of Airbase security details where they still have operational aircraft and can conduct operations.
While the Naval commanders would attempt to funnel their personnel into Marine and Naval Infantry units that were formed with Marne Officers/NCOs in leadership roles and excess naval personnel in all other slots, would be the in their eyes the ideal. The main catch here is having a MEF or MEU around for the Naval commander to justify funneling their personnel into a Marine unit as oppose to sending them to an Army units. Again limited number of these new infantry officers and enlisted personnel would also go back to help base security to bases deemed worthy to defend.
The next thing no matter the Officer rank/Enlisted rank on the food chain back in their native branch, they would be treat as newly minted O-1 for officers and privates for enlisted and would have work their way up the chain by proving themselves so it may be quite a while until O-3, O-4, O-5 would be in a position that would be worthy of their rank. This probably would happen at an very rapid pace than would normally due to them already having rank, but then again they Officers after all. Same with E-5 and higher in the squads, until they show they can lead a fire team, they would be treated as privates and specialist. Once they done that and lead a fire team and they show they are capable of leading a Squad if one is in need of a NCO, then maybe they will be given the spot, and so on back up the chain until they are holding position that in equal to their rank...
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