Transferring from the Air Force to the navy SEALs?

I was wondering if I could get a yes or no answer on this before I go to see the recruiter. My goal is to become a Navy SEAL but as the wash out rate is 70% if things were to not go the way that I want them and I wash out I would like something to fall back on besides being stuck on a ship. So I was wondering if I could enlist in the Air Force as a firefighter, complete my training for that and then get a contract to go to BUD/s, so if I do wash out then I can get sent back to the Air Force. If that's how that works. So can I transfer to BUD/s for the Air Force? And if I wash out will I get sent back to the Air Force?