Spc. Manuel Montenegro, CH-47 Chinook helicopter crew chief, Company B, 6th Battalion, 101st Combat Aviation Brigade, 101st Airborne Division (Air Assault), ensures the windshield of his helicopter are clean while Chief Warrant Officer 2 Nathan Bickham, CH-47 Chinook helicopter Pilot, Company B, 6th Bn., 101st Combat Avn. Bde., ensures that communications equipment is working properly during pre-flight checks at Polk Army Airfield, Fort Polk, La., Aug. 14, 2014. (U.S. Army photo by Sgt. Duncan Brennan, 101st CAB Public Affairs)