A Reservist from the 446th Airlift Wing Safety Office, McChord Field, Wash., demonstrated the coin test to check the tire tread on a vehicle, Sept. 11, 2011. Maintaining proper tire tread levels is one of the most critical vehicle maintenance items, according to the safety office. With the fall and winter months coming up, having good tire tread helps vehicles maintain good traction on wet roads. (U.S. Air Force photo by Master Sgt. Jake Chappelle)
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