The Boeing MH-47G Chinook is a heavy-assault twin-rotor helicopter. It has a Fast Rope Insertion Extraction System (FRIES) for insertion of personnel and equipment, and a trio of machine guns. The Chinook has a crew of three and carries around 30 troops. And, on May 2, 2011, one ferried the body of Osama bin Laden out of Pakistan for the last time.
For the inside story on America's military operations around the world, check out Mark Thompson's blog, Battleland: Where military intelligence is not a contradiction in terms.