The A-10 is not being retired, full story here - http://bit.ly/1f6O9XH
The General Electric GAU-8/A Avenger is a 30mm hydraulically driven seven-barrel Gatling-type cannon that is typically mounted to the United States Air Force's Fairchild Republic A-10 Thunderbolt II. It is capable of firing 4,200 rounds per minute.
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This footage is part of an ongoing documentary of the war in Afghanistan through raw combat footage.
Read more about the war here - http://en.wikipedia.org/wiki/War_in_Afghanistan