WASHINGTON (CNN) -- A 2004 crash that killed everyone on board -- three crew members and three U.S. troops -- was caused by pilots from a Blackwater plane taking a low-level run through a mountain canyon in Afghanistan, testimony revealed Tuesday. "I swear to God, they wouldn't pay me if they knew how much fun this was," the doomed plane's cockpit voice recorder captured the pilot saying shortly before the November 27, 2004, crash. The account of the crash emerged during a House Oversight and Government Reform Committee hearing on Blackwater's performance in Iraq and Afghanistan. In its November 2006...