SPRINGFIELD, Va. — You just never know when all hell is going to break loose. That’s the most amazingly unsettling thing about being in a war zone like Afghanistan. You can prepare for trouble — even expect it — but it will still eventually find you in the most unexpected ways, at times that simply don’t make sense. A first-person account published Saturday by Wall Street Journal scribe Michael Phillips makes that perfectly clear. Phillips watched in horror April 28 as a Taliban suicide bomber blew up a pickup truck carrying several U.S. troops in Zaranj, Afghanistan. The blast killed…