We ain't learned shit in seventy years.
According to research conducted by Marine Corps Capt. Courtney Thompson at the Naval Postgraduate School, the most a Marine should be stuck carrying into the fight is a comparatively measly 58 pounds. While that may sound like a lot for your average Sunday hiker, for America's warfighters, that's a figure that seems impossibly low for today's combat operations.
It's not uncommon to see 150 pound loads on Soldiers these days. My basic kit in Afghanistan was 62 pounds - IBA, helmet, weapon, 210 rounds. That was just the stuff I wore, and didn't include my ruck. And I was one of the lightest loads I saw, given that my job was running around with a Chaplain and not carrying the baseplate of a mortar or the spare barrel for a 240B.
No, I don't have any answers. Nobody does. The fighting force today is generally better fit, more prepared and better trained. It's also a fact that testosterone levels have dropped through the generations which in turn affects muscle and how much a man can carry.
This is the point where I shrug and go "WTF?"