Army Sgt. Bradley McKenzie, left, and Staff Sgt. Kevan Katkus prepare to offload a stretcher carrying a simulated casualty to awaiting soldiers on 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, and the soldiers are assigned to 1st Battalion, 501st Infantry Regiment. U.S. Air Force photo by Alejandro Pena