An F-16 Fighting Falcon prepares to get into position to receive fuel from a KC-135 Stratotanker Dec. 1, 2008, over the Southwestern United States. Two F-16 pilots under the direction of North American Aerospace Defense Command officials from Peterson Air Force Base, Colo., intercepted a Denver-bound airliner April 7, 2010. (U.S. Air Force photo/Master Sgt. John Nimmo Sr.)