There is actually (or at least before the war started) a tremendous amount of truck traffic between Iraq and Syria. If we could not verify that these trucks indeed carried Iraq's WMDs, would you have been okay with taking them out, four months before the shooting started?
All MUNITION AND CHEMICAL TRUCKS:
FORM SINGLE FILE
STAY ON THIS ROAD
WATCH FOR SIGNS
All MUNITION AND CHEMICAL TRUCKS:
FORM SINGLE FILE
STAY ON THIS ROAD
WATCH FOR SIGNS