Lexi, a black labrador, with 1st Battalion, 6th Marine Regiment, 2nd Marine Division, sits with a chew toy after completing an improvised explosive device detection course at Marine Corps Base 29 Palms, Calif., May 22, 2011. The dog handlers participated in Enhanced Mojave Viper, a large-scale predeployment training exercise, in order to hone their skills prior to the unit's upcoming deployment, when the teams will be used to seek out IEDs and bomb-making materials. Photo by Cpl. James W. Clark