When I served as a Navy prosecutor in the early 1990s, the military justice system served America well. We stood alongside warfighting commanders to instill good order and discipline, with a goal of victory in combat. If a Marine did not report for duty, we prosecuted him. If a sailor disobeyed a lawful order, a court-martial followed. If a Bo Bergdahl deserted the Army and conspired with the enemy while Americans died looking for him, we would prosecute the hell out of him and then throw away the key. All of this supported a sharp, buffed-up, well-oiled military without extra...