CALTROP (TIRE SPIKE)

Caltrops were used extensively for operations during the early days of the Office of Strategic Services (OSS), the predecessor of the CIA. A scaled-down version of caltrops used to stop horses during medieval times, this device was also effective in harassing modern-day enemies. When scattered on roads and runways, the non-reflective caltrops would always land with one of the four spikes in an upright position, disrupting vehicular movement. This particular spike is hollow and can puncture a self-sealing rubber tire.