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The student inspects and changes out propellers on a drone during pre-flight checks during Air Force Civil Engineer Center GeoBase program drone training at San Geronimo Air Park, Texas, May 7, 2021. The training focused on pre- and post-flight checks, projecting flight pattern and 3D mapping using images from the drone. The Air Force GeoBase mission is to create and exploit geospatial information and services to optimize agile combat support and minimize operational risk. (U.S. Air Force photo by Brian J. Valencia)
24.0-70.0 mm f/2.8
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