U.S. Army paratroopers and Czech army paratroopers board a Czech helicopter after an air assault exercise as part of Sky Soldier II on Bechyne Training Area in the Czech Republic, Sept. 24, 2015. Sky Soldier is a series of bilateral exercises designed to increase interoperability and strengthen partnerships between NATO airborne forces. The U.S. paratroopers are assigned to the 1st Squadron, 91st Cavalry Regiment, 173rd Airborne Brigade. U.S. Army photo by Markus Rauchenberger