Miss-guided
You aparently seem to equate slim with brains and fat with incompedence. Would you like your bleeding injured grunt picked up in marginal conditions by a bloke/blokess who is straining their suit or would you like to leave them waiting for the good looking, slim, in-experienced young crews to pick them up in better conditions.
You also seem to be a clinician of great years so I was wondering what a medical officer was doing in the feeder. Did you conduct a medical exam in situ or did you ask if any of them had any medical conditions? Are you also able to see that all the people you have labeled are un fit or did you have them all off down the gym and conduct a fitness test?
You seem to be a very opinionated person with nothing but you opinions to back up your post. If your reason for posting was to get responses then you have succeded.
As for fitness V BMI I suggest that you take a bl00dy good look at the England front row. By the way one of the most fitest blokes I knew weighed 18 stone played for the RAF Vets at 40 had NO fat on his body and still strained his size 12 suit. Till he dropped dead a year later from a heart attack.
So as far as I'm concerned you are talking out of your rear end.
Read all the other posts about fitness and you'll find that a lot of people have opinions about fitness levels but experience will tell.