Guided weapons. What is your issue. Can they pass a fitness test? Yes. Are they fit to do the job? Yes. Are the 2/3 guys you refer to pulling their weight (no pun intended)? Yes.
If you want to open a real can of worms then look around and see how many people in the whole of the RAF are overweight and well past their sell by date. Visit an Army barracks and you wont see the same. That is because they realise they are a fighting force and are fit for purpose. Sadly an unhealthy minority(?) of the RAF percieve their job to be Admin or Supply or whatever. With the pace and demands of current ops if your not fit to fight then you really are no use to the service. Too many times i have seen people deploy at short notice to replace some waster who has gone sick due to poor maintanence of his body!
To go back to my first line, the 2/3 guys to whom you refer have probably been on more op dets than they would care to remember. So don't judge books by covers ok?
Rant over. P.S Ant spelling mistakes are anger induced.