A U.S. airman, foreground, monitors the field then calls in close air support during a combined live-fire exercise as part of Northern Strike 15 on Camp Grayling Joint Maneuver Training Center, Mich., July 20, 2015. The airman is a joint terminal attack controller assigned to the New York National Guard's 274th Air Support Operations Squadron. Northern Strike assesses joint air-to-ground capability and involves hundreds of military personnel from 20 different states as well as Canada, Latvia, Poland and Australia. A U.S. airman, foreground, monitors the field then calls in close air support during a combined live-fire exercise as part of Northern Strike 15 on Camp Grayling Joint Maneuver Training Center, Mich., July 20, 2015. The airman is a joint terminal attack controller assigned to the New York National Guard's 274th Air Support Operations Squadron. Northern Strike assesses joint air-to-ground capability and involves hundreds of military personnel from 20 different states as well as Canada, Latvia, Poland and Australia. SHARE: Download: Full Size (1.953162 MB) Tags: photo essays Credit: VIRIN: 935349-N-EDR25-304.jpg Photo Gallery