Agreed. I'd be curious to see what percentage of our combat arms units (even infantry) would be able to conduct ongoing, high-intensity combat operations after covering 20-30 miles a day on foot for a couple weeks. I strongly suspect it would be a much lower percentage than in armies of a century ago, due to lack of real acclimatization/foot hardening.
Based on two weeks training with Royal Marines, I will say they do a lot more of that than we do, at least during entry-level training. And Patrick Hennessey's book mentions how all Sandhurst cadets conduct Exercise Long Reach, a 36 hour, 80 km march over hilly terrain.
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