Army engineers participate in the Eagle Sentinel 17 exercise at Novo Selo Training Area, July 12, 2017. Eagle Sentinel is a multinational training exercise that consists of armor, aviation and light infantry forces. Eagle Sentinel is linked to Saber Guardian 17, a U.S. Army Europe-led, multinational exercise that spans across Bulgaria, Hungary and Romania with more than 25,000 service members from 22 allied and partner nations. Army photo by Capt. Leslie Reed