Sgt. Derek Patrick, a military working dog trainer from Marine Corps Base Camp Pendleton, demonstrates the capabilities of his military working dog at the fields behind the University of Phoenix Stadium at Glendale, Arizona, Sept. 11, 2015. The demonstration was part of Marine Week Phoenix, which allows the Marine Corps to showcase its traditions, history, and values. - Sgt. Derek Patrick, a military working dog trainer from Marine Corps Base Camp Pendleton, demonstrates the capabilities of his military working dog at the fields behind the University of Phoenix Stadium at Glendale, Arizona, Sept. 11, 2015. The demonstration was part of Marine Week Phoenix, which allows the Marine Corps to showcase its traditions, history, and values.