Army pilots and crew chiefs prepare a CH-47F Chinook helicopter for flight in Talkeetna, Alaska, April 26, 2013. The pilots and crew chiefs, assigned to the 1st Battalion, 52nd Aviation Regiment, aided the National Park Service by transporting equipment and supplies to the 7,200-foot level of Kahiltna Glacier to set up a base camp for climbers attempting Mount McKinley this summer. The operation also provided altitude training for soldiers assigned to the U.S. Army Alaska Aviation Task Force. U.S. Army photo by John Pennell