Running is the primary cause of injury in military personnel, not rucking.

“the injury data is really interesting to your point when you look at studies on people in the military what tends to injure soldiers is running that has i mean when they'll even throw people into they'll do studies where they look at injury rates across something like a selection which is you know a long process where these guys are being just hammered and they're all getting injured by running that's not to say that some people don't get injured by rocking but it's like very very small numbers comparatively”