"Sure", he said.
"One two conditions." Pause. "There's no time limit, and no boundaries." Pause for a beat. "I'm going to run off and lie dog for three days. Then I'll get up. Hunt you down. Kill you."
In that moment I achieved enlightenment. Maybe the reason that some people or groups could do far more than others was not some special gifted super-power, but the willingness to put in unthinkable amounts off work for the slightest edge in advantage. Stack this up across all possible advantages, and the results would look impossible.
If you want to read about the Delta Force, I highly recommend the slim book "Leadership and Training for the Fight" by Paul Rowe[0]. It's not technically a history of anything, but it lets you live inside the head of someone with a very different way of viewing the world - almost an alien mindset, and see how they solve problems and function.
[0] https://www.amazon.com/Leadership-Training-Fight-Operations-...