Exactly what he said. I got referred for almost every DoD job I applied for and only two of them sent me offers. That's like 2 out of 40-something applications over the last year. It's not a job offer until you actually get a job offer.
If you get an offer and it's somewhere you actually like, I'd say take that until you get your facility offer from the FAA and, if you don't like where the FAA wants to send you, decline and apply for a later bid.
That's what I should've done, but the pre-employment process for the DoD was a pain in the ass.