U.S. Air Force Col. Marcus Cranston, 99th Medical Group director of medical education endocrinology and preventive medicine, starts a four mile run May 7, 2014, in Las Vegas. Cranston ran four miles in 44 countries in four weeks to raise awareness for Parkinson's disease that began April 4, 2014. Cranston's first run began in Mongolia and his last run ended in Las Vegas. (U.S. Air Force photo by Senior Airman Christopher Tam)
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