Haven't been to OCS but I do run marathons and still get shin splints... I'd hardly consider myself out of shape, fat, or over weight. Whomever mentioned the running around in the crappy shoes nailed it-- bad shoes are probably the biggest contributer to shin splints esp. for those with high arches. Make sure you have arch support (when possible), stretch your shins and do circles with your ankles. Pretty uneducated accusations about shin splints=fat fucks.