FILE - Capt. Corey Wheeler, front, commander of B Company, 1st Battalion, 52nd Aviation Regiment at Fort Wainwright, Alaska, walks away from a Chinook helicopter that landed on the glacier near Denali, April 24, 2016, on the Kahiltna Glacier in Alaska. The U.S. Army helped set up base camp on North America's tallest mountain. The U.S. Army is poised to revamp its forces in Alaska to better prepare for future cold-weather conflicts, and it is expected to replace the larger, heavily equipped Stryker Brigade there with a more mobile, infantry unit better suited for the frigid fight, according to Army leaders. (AP Photo/Mark Thiessen, File)