Detecting the threat
U.S. Air Force Senior Master Sgt. Mathew Mohler, the Air Force Technical Applications Center Detachment (Det.) 460 chief, smashes a piece of concrete with a sledgehammer Sept. 12, 2017, in Fox, Alaska. Det. 460’s seismic arrays monitor nuclear activity in countries of interest to ensure compliance with nuclear treaties. (U.S. Air Force photo by Airman 1st Class Isaac Johnson)
PHOTO BY:
Airman 1st Class Isaac Johnson
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