U.S. Marine Corps Lance Cpl. Johnathan M. W. Ross, an ammo man with Weapons Company, 1st Battalion, 8th Marine Regiment, 2nd Marine Division (MARDIV), carries an ammo can containing M889A1 high explosive rounds to resupply his team’s M252 81mm mortar system for a fire support combined exercise during Integrated Training Exercise 1-16 aboard Marine Corps Air Ground Combat Center, Twentynine Palms, Calif., Oct. 23, 2015. Marines participate in a month-long field exercise demonstrating core mission essential tasks by conducting offensive, defensive and stability operations using combined arms, air integration, and battalion-level infantry tactics in order to strengthen operational readiness as they prepare for world-wide deployment. (U.S. Marine Corps photo by Cpl. Kelly L. Street, 2D MARDIV COMCAM/Released)