>>3965981Not quite.
My experience is USMC, but they have contracts you sign. I signed up on an AF contract, so I could be placed into anything within the Aviation field, needs of the Marine Corps. Once you are sent to an A-School, you get 2 chances to stay within your contract. Like a lot of people assigned to the Air Traffic Control school either flunk out, or have mental breakdowns (Pushing Tin wasn't kidding, it is one of the most high stress jobs there is), so they get sent to another aviation A-School, and if they flunk again then they get needs of the Marine Corps into any old job that needs filling.
If you sign up to do combat camera, there are probably a lot of related jobs, so you sign a contract for general communications. You could end up combat camera, or you could end up a damn radio operator, but you would have to fuck up to end up a cook...
On that, there are different types of military cooks. More than one cook I met in the USMC ended up either working at or owning fancy ass restaurants. Their day job might be rehydrating "egg" powder, but many of them also learn how to actually cook real cuisine, because they might have to cook for a military ball or a state dinner. A surprising number of them needed S or TS security clearances.
Only dumb people sign open contracts. How you end up scrubbing spaces in between ship hulls.