Launcher endurance and safe interception courses

The destroyers carry enough ammunition for thirty minutes of sustained fire, but their launchers were designed to expend it over several engagements. Continuous firing every thirty seconds begins breaking the launchers before the magazines are empty. With missile interception proving insufficient, the ships prepare to sweep through the remaining weapons with their shields. Each course must miss the planet even if a destroyer loses engine power. Otherwise, a ship defending the population could itself become a catastrophic projectile.