Air Force Staff Sgt. Amadio Apilado, a military working dog trainer with the 379th Expeditionary Security Forces Squadron, holds up a photo of Sarge, a fallen U.S. Air Force military working dog that served in the Vietnam War, during a three-mile ruck march at Al Udeid Air Base, Qatar, April 20, 2017. Apilado wanted to honor Sarge during the ruck because it was a commemorative march to honor all fallen military working dogs and handlers. Air Force photo by Senior Airman Cynthia A. Innocenti