A military working dog attacks his handler on command at the training grounds of Lackland Air Force Base, Texas. Military working dogs are enrolled in a 60- to 90-day training program where they are taught to detect explosives and drugs. They are also taught deterrence training and how to protect their handler. (U.S. Air Force photo/Senior Airman Christopher Griffin)

Staff Sgt. Christa Quam holds her puppy which will enter the military working dog program in a year on Lackland Air Force Base, Texas. (U.S. Air Force photo/Senior Airman Christopher Griffin)

Staff Sgt. William Riney rewards his military working dog for detecting narcotics around vehicles on the training grounds of Lackland Air Force Base, Texas. Military working dogs are enrolled in a 60- to 90-day training program where they are taught to detect explosives and drugs. They are also taught deterrence training and how to protect their handler. (U.S. Air Force photo/Senior Airman Christopher Griffin)

Staff Sgt. William Riney rewards his military working dog for detecting narcotics around vehicles on the training grounds of Lackland Air Force Base, Texas. (U.S. Air Force photo/Senior Airman Christopher Griffin)

Soldier and Marine dog handlers run a military working dog through a maze of simulated training scenarios on Lackland Air Force Base, Texas. Military working dogs are enrolled in a 60- to 90-day training program where they are taught to detect explosives and drugs. They are also taught deterrence training and how to protect their handler. (U.S. Air Force photo/Senior Airman Christopher Griffin)

Dog handlers wait patiently with their working dogs before participating in a series of tests determining the handlers control on a working environment on Lackland Air Force Base, Texas. Military working dogs are enrolled in a 60- to 90-day training program where they are taught to detect explosives and drugs. They are also taught deterrence training and how to protect their handler. (U.S. Air Force photo/Senior Airman Christopher Griffin)