A workhorse for the bruisers
A KC-135 Stratotanker from the Pennsylvania Air National Guard's 171st Air Refueling Wing practices flying over Heinz Field, Dec. 30, 2010, for the National Hockey League's Bridgestone Winter Classic in Pittsburgh. The outdoor event was played Jan. 1, 2011, on the home field of the Pittsburgh Steelers. (U.S. Air Force photo/Master Sgt. Ann Young)