Asthma
I was in for 12yrs, downgraded for last 3 with asthma, could serve in RAFG and Cyprus, but not MPA and could'nt go on a possible det to an oli rich state. Even though been told Middle East countries have far better hospitals than our NHS.
The RAF will not take the chance your condition may worsen, especially as you may be flying, or being flown into a moutainous country at night !