I can't help but think that this is a flawed strategy.

1. Destroying your soldiers is not particularly smart.
2. I don't care who you are, you cannot move as fast, nor as far, carrying 100 lbs as 50 lbs.
3. Chronic exhaustion has many side effects. They wonder why the suicide rate is so high without explanation? They wonder why there is so much PTSD? They wonder why our veterans end up hooked on drugs and homeless, unable to carry on relationships?

The body is NOT designed to do this, and will break down under this strain. Of course, military guys will never admit it.