Tendons under both feet streched, arches collapsed causing stress fractures in both ankles, with all that out of whack caused chronic bursitus in both hips. Got to the point to where I could barely walk after running, still at that point today and to top it of now weather is an affecting issue. No real treatment or solution.
The Docs figured it happened 2 weeks into training, which means I ran and trained for a little over a month on messed up ankles. At least one of my DIs was impressed with that, at least thats what he told my folks.
*edit* Cant be a Marine if you cant run. My discharge was such no armed service would take me.