Two U.S.-based defense contractors are working on what could be the most promising solution to the problem of drone swarms yet. General Dynamics and Epirus, Inc., are teaming up to place a high powered microwave cannon on an armored vehicle used by the U.S. Army. The result could be a weapon capable of tackling drone swarms and disabling vehicles on land and at sea, but the big question is how it would affect human beings. The U.S. military trialed Active Denial, a microwave radiation-based crowd control system designed to ward off rioters with bursts of pain.