In WWII, the basic load for a rifleman was 80 rounds for the Garand. In most cases, the supply train was just behind him, and he didn't have to carry 50-60 pounds on his back...beans, bullets, and gear were brought up to him as-needed, from a convenient dump in the rear.
In RVN, the basic load for the M16 was 300 rounds because of the rate of fire. In addition, we carried 50-60 pounds of supplies and gear, through the woods and the swamps, in 100% humidity and 100-degree temps. Many of us carried much more than the basic load of ammo, and skimped on the other weight. There weren't any "girls" doing it, back then.
My point to MIV remains this: you go try to accomplish something like what we did, and what the troops are doing now...including female troops (you'd be better off not to call them "girlies", either)...and, if you can do it better, then you have earned the right to criticize. Otherwise, you're just blowing smoke.