A U.S. Marine Corps Military Working Dog, Elmer, assigned to Bravo Company, 1st Battalion, 2d Marine Regiment, carries a toy, given to him as a reward for successfully completing a training exercise, aboard Camp Leatherneck Helmand province, Afghanistan on July 14, 2014. Dogs are trained to find improvised explosive devices (IED), and are used as a safeguard for Marines while on patrol. (Official U.S. Marine Corps photo by Cpl. John A. Martinez Jr. / Released)