A catastrophic kill, K-Kill or complete kill refers to damage inflicted on an armored vehicle that amounts to complete destruction of the vehicle, rendering it both permanently non-functional and unrepairable. The term "knocked out" refers to a vehicle which has been damaged to the point of inoperability and abandoned by its crew, but is not obviously beyond the point of repair. While a knocked-out vehicle may be later determined to be irreparable and written off, a K-kill is more obvious and usually involves the destruction of the vehicle by fire and/or explosion. Among tank crewmen it is also commonly known as a "brew up", coined from the British World War II term for lighting a fire in order to brew tea. The expression arose because British troops used an old petrol tin with holes punched in the side as a makeshift stove on which to brew their tea. The flames licking out of the holes in the side of the tin resembled a burning tank and thus the expression was coined. Typically a catastrophic kill results in the ignition of any fuel the vehicle may be carrying as well as the detonation (cooking off, or sympathetic detonation) of its ammunition. A catastrophic kill does not necessarily preclude the survival of the vehicle's crew, although most historical casualties in armored warfare were the result of K-kills, particularly in the case of gasoline-powered vehicles with a greater propensity to catch fire when badly damaged. This type of kill is also associated with the jack-in-the-box effect, where a tank's turret is blown skyward due to the overpressure of an ammunition explosion. Some tank designs employ blow-off panels, channeling such explosions outside of the vehicle, turning an otherwise catastrophic kill into a firepower kill.
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