50.59 (+0.76) 
Excalibur: The Most Important Invention Since Gun Powder
Why is Raytheon's Excalibur a revolutionary weapon? One Excalibur shell can destroy targets that in the past would have required dozens of conventional artillery rounds. Excalibur is a 155mm precision-guided artillery round with extended range. Successfully fielded in 2007, Excalibur is the next generation family of projectiles for the U.S. Army and Marine Corps artillery.
Raytheon is the first company to accomplish the tremendously difficult task of integrating sensitive GPS precision guidance technology onto an artillery round. This capability provides soldiers with an accurate, first round fire-for-effect capability in an urban setting. Excalibur's proven six-meter (19.7 feet) accuracy reduces collateral damage, which saves warfighter lives and reduces the chance of civilian casualties.
Raytheon is currently in the process of testing the Excalibur Ib. The Excalibur Ib's design is based on the combat-proven Excalibur Ia, but it uses fewer parts and requires simpler manufacturing. These changes have resulted in lower costs and increased reliability. When the battle calls for precision with discrimination, Excalibur is the weapon of choice.