Find a clock, and watch five seconds tick by. For allied soldiers driving tanks through the Iraqi desert, that's a generous amount of time in which to do the following: spot a vehicle through the optics system, consult the last available coordinates for all known battlefield combatants, try to identify the vehicle's type, check if it has a special panel that appears as a cold spot through a thermal sight, add it all together and decide whether the image on the screen is friend or foe. If it's the latter, the crew, under pressure to shoot before being shot at, is...
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