Army General John Campbell looked stricken Thanksgiving Eve as he detailed how U.S. troops blasted away at an Afghan hospital last month, killing 30. His grim visage made clear that he’d rather have been any place in the world other than that podium in Kabul. Unfortunately, he wasn’t the first American commander to face second-guessing spotlights, highlighting in hindsight what now seems so obvious: how could such a snafu have happened? The Oct.