Mil Tech — Excalibur Satellite-Guided Artillery Shells Performing Well in Iraq
Mar 31 2008
U.S. Army troops in Iraq have fielded a weapon allowing them to be more precise in targeting and limiting collateral damage.
Col. John Tanzi, of TCM-Cannon Systems at the Fire Center of Excellence in Fort Sill, Okla., says the GPS-guided Excalibur artillery shell was deployed to Iraq in May 2007. According to Tanzi, Excalibur is a unitary high explosive projectile like the M107 155mm shell but with unique characteristics that give it unmatched precision.
“The original requirement was a munition that would impact within 20 meters of target,” Tanzi says. “With Excalibur in theater, we’re seeing impact within 4 meters on all targets at ranges between 7 and 24 kilometers.”
A M107 155mm shell can miss a target by up to 180 meters at maximum ranges. Excalibur also limits collateral damage.
“With standard projectiles, you have a low angle of attack, producing a teardrop-shaped fragmentation pattern on the ground that’s unpredictable,” Tanzi says.
But Excalibur comes in virtually vertical on target, making a circular fragmentation pattern.
Also, within three seconds of impact, if Excalibur loses GPS guidance or misses its intended target by 30 meters or more, it renders itself inert.
“Then it’s just 106 pounds that hits the ground,” Tanzi says. “That’s proven itself 100 percent of the time in test shots, and it’s happened on two occasions in theater.”
Excalibur is made by Raytheon Missile Systems in Tucson, Ariz. David Brockway, Raytheon’s business development manager, says the total objective procurement for Excalibur is approximately 30,000 rounds.
About the author: Alan M. Petrillo is a Tucson, Ariz. freelance writer who works in a wide variety of fields, writing for national and regional magazines and newspapers. He’s also the author of the historical mystery, Full Moon (JoNa Books, 2005).

