In my experience as an army officer, the “wider net” is cast for positions in the army where that fitness isn’t really necessary; ie, logistics units, cooks, admin, etc. I spent all of my time in infantry units and the people in those physically fit, high T jobs are still almost all men that are physically fit and aggressive. And that’s in normal units, so not even counting special forces and rangers. I also met some guys that looked fat and soft that fought like devils when pressed and would run exactly as fast as they needed to to pass a fitness test.