Master-at-Arms Greg Berth and canine Ivan search for hidden narcotics inside an empty FedEx Field kitchen in Landover, Md., Feb. 13, 2015, during a joint explosive proficiency evaluation with Soldiers from the 947th Military Police Detachment (The Old Guard) and masters-at-arms from Naval District Washington's military working dog program assigned to Joint Base Anacostia-Bolling. (Joint Base Myer-Henderson Hall PAO photo by Damien Salas)