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Smoke screen
Airborne obscurant using gas and particulates / From Wikipedia, the free encyclopedia
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A smoke screen is smoke released to mask the movement or location of military units such as infantry, tanks, aircraft, or ships.
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Smoke screens are commonly deployed either by a canister (such as a grenade) or generated by a vehicle (such as a tank or a warship).
Whereas smoke screens were originally used to hide movement from enemies' line of sight, modern technology means that they are now also available in new forms; they can screen in the infrared as well as visible spectrum of light to prevent detection by infrared sensors or viewers, and they are also available for vehicles in a super-dense form used to block laser beams of enemy laser designators or rangefinders.