Dirtboyz ROCK the mission
                WHITEMAN AIR FORCE BASE, Mo. - Senior Airman Travis Knighten, 509th Civil Engineer Squadron payment and equipment operator, grinds out tar sealant from the crevices of a parking lot, Tuesday. Repairing the sealant protects the concrete from weather and helps prevent cracking.(U.S. Air Force photo/ Senior Airman Carlin Leslie) 
                
                    
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