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Trapping Bin Laden
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6. Watching the target
Once an area has been identified as a potential target, the US military can use a device known as an unattended ground sensor to sit and wait for something to happen. These are designed to cut the "sensor to shooter" time - the often crucial gap between gathering intelligence and sending in military forces.
The most sophisticated sensors can alert military forces by detecting:
  • Vibrations caused by people or vehicles
  • Noise including machinery or voices
  • Night-time movements picked up by infrared
  • Speed and direction of movement, if the units are in a network
    Once alerted, the sensors relay information to a command centre where a laptop may be sufficient to process the data and provide enough information to launch a strike.

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