Anti-drone capabilities of Northrop Grumman’s 25 mm grenade launcher developed for the U.S. Army’s PGS program.The launcher uses the XM157 computerized sighting system from Vortex Optics and High-Explosive Proximity (PROX) munitions.These rounds use a proximity sensor to detonate in flight without requiring fire-control programming. They are specifically designed to engage and defeat both stationary and moving unmanned aerial systems (UAS).