U.S. Airmen walk during the Tim Davis Memorial March in Flatonia, Texas, Oct. 17, 2011.
The march, which began in San Antonio, Texas, honors fallen special tactics Airmen and consists of six three-man teams relaying 24 hours a day. Each team was scheduled to walk about 144 miles while carrying 50-pound rucksacks and a baton engraved with the name of a fallen Airman from an Air Force Special Tactics team. (DoD photo by Staff Sgt. Sharida Jackson, U.S. Air Force). Original public domain image from Flickr