The Honorable Mark T. Esper, Secretary of the Army, gives Army challenge coins to Polish Soldiers from the 12th Mechanized Brigade, 12th Mechanized Division, at the 7th Army Training Command's Hohenfels Training Area, Hohenfels, Germany, during Allied Spirit VIII, Jan. 30, 2018. Allied Spirit VIII includes approximately 4,100 participants from 10 nations, Jan. 15-Feb. 5, 2018. Allied Spirit is a U.S. Army Europe-directed multinational exercise series designed to develop and enhance NATO and key partner's interoperability and readiness. (U.S. Army photo by Staff Sgt. David Overson)