Mush!
Ten-year-old Katie Powell pets Boomerang, one of Maj. (Dr.) Thomas Knolmayer's sled dogs, before riding with the doctor on his final training run before the start of the 2006 Iditarod Sled Dog Race. Katie is the daughter of Senior Master Sgt. Chris Powell of Travis Air Force Base, Calif., and is suffering from Ewing's Sarcoma, a rare bone cancer. (U.S. Air Force photo/Tech. Sgt. Keith Brown)