Staff Sgt. Edward Reid, 36th Mobility Readiness Squadron engineering technician, counts how many times the hammer drops on the dynamic cone penetrometer Oct. 29, 2013, on Naval Base, Guam. The technicians hammer the device into the pavement to test the durability of the pavement for follow-on Department of Defense aircraft that could potentially land without cracking the asphalt in a real-world scenario. (U.S. Air Force photo by Airman 1st Class Emily A. Bradley/Released)
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