Marines from Battery O, 5th Battalion, 14th Marine Regiment, 4th Marine Division prepare to fire artillery rounds from an M777A2 155 mm howitzer at East Fuji Maneuver Area, Japan Sept. 11. Battery O is in Japan as a part of the Unit Deployment Program, a program designed to increase the training level and unit continuity of Marine Corps units stationed in the continental United States. Realistic scenarios and combined exercises are a highlight of the UDP, bringing Marines of many different units together, sometimes with foreign forces. (U.S. Marine Corps photo by Pfc. Terence G. Brady/Released)