A member of the U.S. Army takes part in the Exercise Coalition VIRTUAL FLAG 19-4 at Kirtland Air Force Base, N.M., Sept. 10, 2019. With the most participants ever hosted at the DMOC, the participants were presented with a contemporary multi-domain threat where exercise participants had to think through difficult problem sets, including several that the Chief of Staff of the Air Force has challenged the U.S. Air Force to address. (U.S. Air Force photo by Staff Sgt. Kimberly Nagle)

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Photo by: Staff Sgt. Kimberly Nagle |  VIRIN: 190910-F-XR514-1045.JPG