Pull the pin… see smoke in the wind
Col. Bradley Cochran, vice commander of the 28th Bomb Wing, pulls a pin to trigger an explosion at Ellsworth Air Force Base, S.D., Nov. 14, 2016. From a safe distance away, Cochran was given the opportunity to conduct a controlled explosion simulating expeditionary operations. (U.S. Air Force photo by Airman 1st Class James L. Miller)