Diversity Day Mud Run participants clear a section of their two mile course September 20, 2015 at Al Udeid Air Base, Qatar. The mud run challenged 106 runners with several obstacles from low crawling, T-wall climbing, barrier hurdles, and a Ôdeep freezeÕ cold mud pool. The event was held to help spread the word of Diversity Day, an initiative started by the Department of Defense for diversity events held throughout the year. (U.S. Air Force photo/ Staff Sgt. Alexandre Montes)