This gouge is five years old, so take it with plenty of grains of salt, but we didn't do tons of running when I was at OCS. Make sure you can run 1.5 miles in the appropriate time for your age group, and beyond that, focus more on strength and conditioning. Everyone in your class will look like spaghetti during push-up time at some point, but you really don't want to be the first guy to flop down and give up. I ran three miles a day at my goal pace while I was getting ready for OCS, and was one of the fastest in my running group.
Then again, I didn't use any sweet running apps. I'd be running marathons now if I had. Daily.