Run times are a key predictor for musculoskeletal injuries, Army researchers say

The issue, like you said LTC, is the "one size fits all" approach. Since we don't start units from the beginning, there are constantly Soldiers PCSing in and out, the Team is never on the same level of fitness. A new Private straight out of AIT/IET has been doing nothing but PRT and now is getting thrown to the wolves when his light Scout platoon wants to run 6 miles for PT, but that new PVT's body is in no way ready for that, so he gets hurt. The rest of the platoon had built up. I saw this happen countless times throughout my career. We don't build units properly.
We stick people in mechanized world for 7 years, mech places less priority on cardio and fitness, then move them to the 101 or 82 and expect them to keep up. It not only injures them, but screws their career since the mech and light worlds are so different.

PRT is another reason injuries happen. It...just...plain...sucks. It also is affected by the constant in and out of personnel, but it just doesn't provide effective exercise for Soldiers.

The article mentioned the AWCs. Yes, they are a fantastic initiative, but how many Infantry and Armor units are going to allow their Soldiers to take time off work and attend AWC appointments? At the BN Command level I'm sure they say "go get the help you need" etc, but at the squad level, not so much. Soldiers are afraid to go to sick call (another reason injuries are so bad), let alone schedule something else.

What I do not see in that article is the possibility (probability)
Those with faster run times are more likely faster because they engage more commonly in activities that expose them to more injuries then the slower runner that leads mostly sedentary life other then when forced to exercise.

The obvious solution is to go back to running 5 miles a day so bodies are trained for it.