Oscar Hernandez (second from left), a training specialist from the U.S. Army Space and Missile Defense Agency, guides Ohio Army National Guard Soldiers from the 1487th Transportation Company on how to detect electromagnetic interference on an AN/PSN-13 Defense Advanced GPS Receiver (DAGR) June 23, 2018, during annual training at Camp Grayling Joint Maneuver Training Center in Grayling, Mich. This training provides Soldiers guidance in the event they encounter a contested electronic warfare environment. (Ohio National Guard photo by Staff Sgt. Michael Carden)