Oh, I fully agree. My BMI has hung out between 27 and 28.5, aside for a year or so, for nearly a decade now. I have never failed my military pt test and have never had any issues with my flight physical, yet at my yearly appointment, I'm told I should lose some weight...usually by some flight doc that's stretching the seams and zipper on his flight suit. I dropped down to 175 from 195 (BMI 24.4) a few years ago and my wife hated it. Said I looked sick, and you know what? I didn't feel good. To maintain 175 I had the eat next to nothing and do cardio like a maniac. Conversely, at 195 I can eat and drink nearly anything in moderation, can miss some workouts, and the scale stays within a pound or two every time I step on it.
This policy, like many organizational "health" policies, is simply trying to fit as many people as it can into strictly defined health categories that don't accurately model the real human body.