The Deployable Tactical Engagement System is a training device manufactured by SAAB used by the British Army. It consists of an infrared projector mounted on the SA80 and the Vektor R4, and a harness with receptors to receive the beams to simulate hits when firing blank ammunition.
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See also Small Arms Weapons Effects Simulator Realistic Engagement And Combat Training System Airsoft Quasar Military exercise Paintball Opposing force