Yyoda, a U.S. Air Force military working dog, lunges at U.S. Air Force Senior Airman Laci Mendez, 97th Security Forces Squadron working dog handler, after being provoked through aggressive body posturing and verbal cues during training at the kennels Feb. 10, 2015. Military working dogs are trained to attack through the use of verbal commands, but also of their own accord when they perceive a threat. (U.S. Air Force photo by Airman 1st Class Megan E. Acs/Released)