Crew chiefs from the 3rd Battalion, 158th Aviation Regiment, 12th Combat Aviation Brigade, from Katterbach, Germany, do preflight checks and maintenance on their UH-60 Black Hawk helicopters, before paratroopers from the 173rd Airborne Brigade conduct an airborne operation from the aircraft at Adazi Training Area, Latvia, June 22, 2014. Approximately 600 paratroopers from the brigade are in Estonia, Latvia, Lithuania and Poland as part of an land-forces exercise to demonstrate commitment to NATO obligations and sustain interoperability with allied forces. (U.S. Army National Guard photo by: Staff Sgt. Brett Miller, 116 Public Affairs Detachment/ Released