As seen through a night-vision device, U.S. Army Spc. Ronald Kelly conducts a post-flight inspection on a Black Hawk helicopter's tail rotor at Mihail Kogălniceanu Air Force Base, Romania, Dec. 9, 2015. Kelly is a crew chief assigned to the 1st Cavalry Division's 3rd Battalion, 227th Assault Helicopter Battalion, Air Cavalry Brigade. U.S. Army photo by Staff Sgt. Steven M. Colvin