Lance Corporal John Roan, left, a squad leader with E Company, 2nd Battalion, 2nd Marine Regiment positively identified an improvised explosive device just before speaking with one of the instructors during Integrated Training Exercise 1-16 at Marine Air Ground Combat Center, Twentynine Palms, Calif., Oct. 29, 2015. Marines at ITX demonstrate core infantry mission essential tasks while conducting offensive and defensive operations. - Lance Corporal John Roan, left, a squad leader with E Company, 2nd Battalion, 2nd Marine Regiment positively identified an improvised explosive device just before speaking with one of the instructors during Integrated Training Exercise 1-16 at Marine Air Ground Combat Center, Twentynine Palms, Calif., Oct. 29, 2015. Marines at ITX demonstrate core infantry mission essential tasks while conducting offensive and defensive operations.