U.S. Marine Corps Cpl. Sean Grady and Ace, a military working dog trained to detect improvised explosive devices, provide security during a patrol in the Khan Neshin district of Afghanistan's Helmand province, April 27, 2012. Grady, a dog handler and pointman assigned to Echo Company, 1st Light Armored Reconnaissance Battalion, and Ace have located 16 roadside bombs, the most of any team in their battalion since arriving in the province last October.