Visible crew/equipment: When Will Smith and Gene Hackman are fleeing the fortress, Will shoots at the pursuing truck with the shotgun, causing it to flip. As it lands on its top, the tube used to launch the pole that flipped it is visible.
Visible crew/equipment: When the truck flips after the "jar" is blown up, a rig that the truck is on can be seen moving left frame.
Chosen answer: If there are, it is kept secret. But there is ECHELON http://en.wikipedia.org/wiki/ECHELON which is able to listen in on most forms of electronic communication.
Andreas[DK]