U.S. Army 2nd Lt. Preston Button, left, with the 500th Engineer Company, 15th Engineer Battalion, 18th Engineer Brigade, listens to advice from Staff Sgt. Michael Santurri, an observer-controller, after Soldiers with the company came into contact with simulated opposition forces played by Soldiers with the 1st Battalion, 4th Infantry Regiment during a convoy at the 7th Army Joint Multinational Training Command's Hohenfels Training Area in Hohenfels, Germany, Sept. 4, 2014, during exercise Saber Junction 2014. Saber Junction is a U.S. Army Europe-led exercise designed to prepare U.S., NATO and international partner forces for unified land operations.