What happened to the $87 billion?

Over the weekend, this story broke about troops in Iraq refusing to drive fuel trucks that were not armored through a dangerous area. The vehicles were considered "deadlined" which basically means it isn't safe to drive 'em. If it had been one guy who said no to the mission, you could figure we're talking about irrational fear. But there were 17 soldiers who refused to make the run. So what I would like to know is what happened to all the money Congress approved? Why do our troops not have adequate supplies? Well, President Bush? You got an answer for that?