The 82nd Airborne Division, in their demonstrations of mass drops including heave equipment, finally got smart. (Well...as smart as guys who commute to work by parachute can be.)
Their favorite DZ had a bit of ridge running down through the middle of the great open area.
They dropped the Troops onto the side close to the Grand Stand.....and subsequent drops of vehicles took place very near the ridge well away from the Visitors.
Stashed behind the Ridge was all the serviceable vehicles.....and what was dropped was old junked vehicles gleaned from the old policy of dropping good serviceable vehicles.
Shortly after the dummy vehicles landed on the DZ....from behind the ridge came the previously stashed equipment.
All very impressive....and far cheaper in the long run than dropping Ready Unit Vehicles, Artillery Pieces, and the like.