Listening Eagle exercise participants secure an area at Saylor Creek Range Complex, Idaho, May 10, 2016. The joint exercise originally began with the U.S. and the British armed forces in 2013. (U.S. Air Force photo by Airman Alaysia Berry/Released)

Participants of the Listening Eage exercise practice care-under-fire scenarios at Saylor Creek Range Complex, Idaho, May 10, 2016. Each nation inolved in the Listening-series exercises takes turns hosting the joint-exercise annually. (U.S. Air Force photo by Airman Alaysia Berry/Released)

Listening Eagle exercise participants scan the area for potential threats during a training scenario at Saylor Creek Range Complex, Idaho, May 10, 2016. The tough weather patterns in Idaho helped simulate different combat enviroments to make the exercise more realistic.(U.S. Air Force photo by Airman Alaysia Berry/Released)

A U.S. Marine takes a breath after removing his mask at the Saylor Creek Range Complex, Idaho, May 26, 2016. The Marines used exercise rounds, similar to paint balls, to add realism to exercise scenarios. (U.S. Air Force photo by Airman Alaysia Berry/Released)