The Bastard Son of the Shafman wrote:Shave skull = more vulnerability to both cold and heat. Especially sun.
Too much sun on the noggin bakes the brain, even with sunblock applied.
Couple of things- Hair probably does have an insulating factor. However, until the last couple of years no one in the Army was allowed to save their heads, out side of basic training. Even then in basic training hair is allowed to grow out into a buzz cut look and then cut into a high and tight. After basic training you have the option of growing your hair out within Army regulations.
Another thing to remember is that if you're in the military, you don't run around outside in uniform without wearing a PC (patrol cap), boonie cap, or K pot.
The main point is this, is 2.5 gallons of water silly to take on a 1 hour walk? Not really, if (1) that water is mostly there for resistance. It seems to me that Mr. @fitter went with the camel back because it was convenient and easy way to add resistance weight (2) It's always good to have water with you.
Another thing, how do we know that camel back is all water? I've seen plenty of camel back assault packs, that could carry 20-30 pounds of stuff and wasn't designed for just water. The 20 lbs of weight could easily be mostly dead weight with a 1/2 gallon to 1 gallon water bladder.
***Just checked- at most this @fit idiot could have had on him was 1.5 gallons of water. The pack he's wearing is designed to carry at most 2 water bladders 3 L each or .75 gallons each. I doubt he had more than one bladder in his camel back.*****
So in the end he got smoked by a 20 lb pack- about what you'd expect from a @fitter.
But we're getting off topic. Couch is a gin swilling pot bellied pig.