Caltrops were used extensively for Jedburgh Team operations during the early days of the Office of Strategic Services (OSS), the predecessor of the CIA. A scaled-down version of caltrops which were used to stop horses during medieval times, this device was also very 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 and causing a considerable degree of damage. This spike is hollow and can puncture a self-sealing rubber tire.

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