It may be group specific, or even battalion specific, but I have seen a trend of team guys looking to be at around 210-220 on average. It may be the effects of the Thor/Crossfit type training, but it seems like guys like walking around a little bigger these days.
I had a 275 pounder in my xray class and he ended up hurting his legs from the overuse. Carrying around a lot of unnecessary weight will hinder your upper body endurance, long range run and long range ruck movements. 6'6" frames are build differently and I wouldn't think weight would be the best metric to use, I would focus on body fat percentage and being well proportioned.