As far as the military standards go, the general standards aren't very difficult to achieve. As taxpayers, we're footing the bill for their health care, so I think the responsible thing to do is to make sure they maintain standards that would keep them in good health. As for combat soldiers, I don't think fitness is really an issue.
Personally, I do more than most. I've been playing rugby since 1996 and competing in strongman competitions since 2004 and even amongst all of my fellow teammates and strongman competitors, I'm know as the guy who is always busting his ass on the 'off days', if there is such a thing. I dream about training and I live to compete. Unfortunately, at 37, my body doesn't heal like it did when I was younger. Decades of beating and banging takes it's toll.