Surveillance by small, cheap quadcopter drones has made substantial battlefield advances nearly impossible amid Russia’s ongoing war on Ukraine. Armored vehicles are quickly spotted and destroyed with either drones or artillery. Soldiers on foot seldom fare any better. Negating the other side’s drone capabilities would be a tremendous advantage, but conventional air defense isn’t good enough. Fortunately, the U.S. has developed a solution: 30mm chain guns — traditionally mounted on Apache