A spike strip used to impede or stop the movement of a vehicle by puncturing the tires. Spikes, pointing upwards, are affixed to a pipe or rail. As the vehicle rolls over the spikes, they are punctured.
Shoulder firedweapon the fires a high speed rocket. Used for shooting down airplanes, helicopters etc.
The US military has stinger missles, but never needs them because America's enemies don't even get the chance to fly their planes. They are blown up on the ground.