Col. Michael Grismer, 436th Airlift Wing commander, fist bumps Staff Sgt. Caleb Dubourg, 436th Maintenance Squadron aerospace propulsion craftsman, as he finishes the 5K Warrior Run July 30, 2015, at the track on Dover Air Force Base, Del. The run began and finished on the new base track that was built in accordance with International Association of Athletics Federations’ standards and features a plexitrac accelerator surface. (U.S. Air Force photo/Airman 1st Class William Johnson)
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