U.S. Air Force Tech. Sgt. James King III and Staff Sgt. Corbin Simonsen, Landing Zone Operations Course students, test the strength of the soil at a simulated landing zone using a dynamic cone penetrometer at Schafer Field in St. Jacob, Illinois, July 30, 2021. As part of the Landing Zone Operations Course students simulate surveying a landing zone.
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NIKKOR Z 24-70mm f/2.8 S
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