For 22 years I was a Delta Force operator; I thought I’d left the battlefield behind – until my son’s teacher called, her voice choked: “Seven senior football players have put him in the hospital, they’re rushing him straight to the ICU.” The principal leaned back in his leather chair and sneered: “What are you going to do, soldier boy?” Seventy-two hours later, the entire team – and the fathers who showed up at my door at 9 p.m. with baseball bats in their hands – finally learned what it means