Cpl. Jeremiah Gerber of the Military Working Dog Platoon,

Cpl. Jeremiah Gerber of the Military Working Dog Platoon, Headquarters and Support Company, 1st Law Enforcement Battalion, I Marines Expeditionary Force, performs obedience and control drills with his drug detection dog, “Rocky,” during a training exercise aboard Camp Pendleton, Calif., Sept. 9, 2015. Exercises like this are designed to help military working dogs familiarize themselves with the scent of potentially harmful substances that they may have to track in the field. (U.S. Marine Corps photo by Pvt. Robert Bliss/Released)