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Pacific Ocean, April 18, 2013 - A MK 15 Phalanx close-in weapons system (CIWS) is test fired on the flight deck aboard the aircraft carrier USS Carl Vinson.
Stocktrek Images/Stocktrek Images/Getty Images
Definition: (DOD, NATO) In artillery and naval gunfire support, information in a call for fire to indicate that friendly forces are within 600 meters of the target.

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