Staff Sgt. Edisson Vargas, a native of White Plains, N.Y., prepares his soldiers to fire an Excalibur round for the first time on Camp Taji, northwest of Baghdad, April 26. The Excalibur is a specialized round guided by GPS. Vargas is assigned to Battery A, 2nd Battalion 11th Field Artillery Regiment 'On-Time,' 2nd Stryker Brigade Combat Team "Warrior," 25th Infantry Division, Multi-National Division - Baghdad.