ive got some pretty bad nerve damage to my groin and "the boys". i had an electrical stimulator placed into my back but since it still hasnt helped me all that much i " dont meet the retention standards ". its not all that bad though. im looking at a commercial diving school as a friend of mine had a back injury and became an underwater welder. he said due to the zero gravity it doesnt hurt his back at all and now makes a pretty hefty check. so maybe its all for the better.