Quoted:
Do you have a professional need to do that kind of thing? Is it a personal desire to do it? Either way their is nothing wrong with it, but if you aren't used to it then you should work up to it.
Also remember, that in the Army you do a 20K ruck quarterly (or was it semi annually?). It never seemed like a big deal at Bragg, but it was a mother during a Korean Summer.
Yeah, the school I am in right now has us doing 3 or more ruck marches for time. They aren't long distance, but they have some really nasty hills.
We(friends and I down here) have been doing quite a bit of hiking in our off time, but it isn't the same until you put some weight on you. We are tying to build up our endurance and then hit the steep hills later.
This kind of stuff reminds me why I joined the AF in the first place.
ETA:
I would never mess with those SNCO's. Anyone who could make a 20+ year career in the infantry is a bad sombitch. Most of them are as tough as leather and can still run like the wind.