BARKSDALE AIR FORCE BASE, La. --   Vvelma, 2nd Security Forces Squadron military working dog, waits for a command from her handler during bite training at Barksdale Air Force Base, La., Dec. 21, 2015. Military working dogs must learn the basic building blocks of obedience before moving on in training. When a dog’s adrenaline kicks in it is important for her to obey her handlers commands in order to prevent any unnecessary harm. (U.S. Air Force photo/Senior Airman Amanda Morris)