A Soldier with the Ohio National Guard’s 137th Signal Company checks his location on an AN/PSN-13 Defense Advanced GPS Receiver (DAGR) June 22, 2018, during annual training at Camp Grayling Joint Maneuver Training Center in Grayling, Mich. Soldiers received instruction on detection and mitigation of electromagnetic interference from a team from the Army Space and Missile Defense Agency to aid them in working in a contested electronic warfare environment.

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