SEVERAL years ago I spent time with a platoon of Army infantry at a remote outpost in eastern Afghanistan, and after the deployment I was surprised that only one of the soldiers chose to leave the military at the end of his contract; many others re-upped and eventually went on to fight for another year in the same area. The soldier who got out, Brendan O’Byrne, remained a good friend of mine as he struggled to fit in to civilian life back home.