U.S. Army Spc. David Casement, right, and Staff Sgt. Kenneth Andersen wash a CH-47 Chinook helicopter at Bagram Airfield, Afghanistan, Dec. 29, 2015. Casement is assigned to the Michigan National Guard's 3rd Battalion, 238th Aviation Regiment, General Support Aviation Brigade. U.S. Army photo by Sgt. 1st Class Nathan Hutchison