FIRING EXCALIBUR U.S. Army Staff Sgt. Edisson Vargas prepares his soldiers to fire an Excalibur round for the first time on Camp Taji, northwest of Baghdad, April 26, 2008. The Excalibur is a specialized round guided by a global positioning system. The soldiers are assigned to the 25th Infantry Division's 2nd Stryker Brigade Combat Team, 11th Field Artillery Regiment. SHARE IMAGE: Download Image: Full Size (0.08 MB) Photo By: VIRIN: 770498-T-NKZ96-523.jpg Photo Gallery