It is driven to hunt and capture prey. It looks like a leaner, more agile German Shepherd. It has a 270-degree field of vision and the force of its bite equals 1,400 pounds per square inch. It can run 30 miles per hour. It can withstand the heat of the desert and an August day in Washington, D.C. It can smell drugs, bombs and unmarked graves. It’s deadly enough to help take out Osama bin Laden, but gentle enough to push a toddler in a toy car.