U.S. Air Force Senior Airman Daniel Caldas, 100th Security Forces Squadron Military Working Dog handler from Milford, Mass., opens the door of his government patrol vehicle to allow MWD Vvonya to exit March 13, 2015, on RAF Mildenhall, England. Caldas and Vvonya were returning from patrol duties. (U.S. Air Force photo by Gina Randall/Released)