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Johnny Carson, with sidekick Ed McMahon (left), reigned for nearly 30 years on late-night TV. His nightly viewership, averaging as much as 15 million, was more than the current audience of "Tonight" successor Jay Leno and CBS rival David Letterman combined. (Associated Press)

Johnny Carson, with sidekick Ed McMahon (left), reigned for nearly 30 years on late-night TV. His nightly viewership, averaging as much as 15 million, was more than the current audience of "Tonight" successor Jay Leno and CBS rival David Letterman combined. (Associated Press)

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Best combat rifles of all time

A combat rifle is a military service rifle that fires a full-power rifle cartridge, a mainstay of every modern army in the world. See the best combat rifles ever made.