Army Sgt. Bradley McKenzie, left, and Staff Sgt. Kevan Katkus look out the side of their UH-60 Black Hawk helicopter for safety clearance while conducting flight operations over Joint Base Elmendorf-Richardson, Alaska, Oct. 21, 2015. McKenzie and Katkus are crew chiefs assigned to the Alaska Army National Guard's 1st Battalion, 207th Aviation Regiment. U.S. Air Force photo by Alejandro Pena