Members of the 436th Civil Engineer Squadron team pavement and heavy equipment operators section, remove rubber from Runway 19 on Oct. 15, 2013, using large Oshkosh tractors with spinning brush attachments at Dover Air Force Base, Del. A highly concentrated, bio-degradable soap is applied to the runway and scrubbed by the machines before the runway is rinsed off. (U.S. Air Force photo/Greg L. Davis)
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