Spc. Zachary Baum, petroleum laboratory specialist, explains his military occupational specialty at the Quartermaster Liquid Logistics Exercise, Camp Pendleton, Calif. Baum is from Big Bear City, Calif. QLLEX is a joint forces exercise that 64 units at eight locations across the continental U.S. will deliver more than 3.25 million gallons of petroleum and produce 479,000 gallons of water, designed to challenge and develop the battalion's staff military decision making skills. (U.S. Army photo by Spc. Thomas X. Crough/Released)