Despite being commercially available, drones can be a real threat. They can barge into no-fly zones, engage in mid-air crashes, reconnaissance missions, or even conduct deadly air-strikes. The risk of such attacks never wears off but in order protect its critical installations against rogue UAVs, United States military is working on some lethal counter-drone weapons. The service, in collaboration with defense manufacturer Raytheon, has produced two Counter-Unmanned Aerial Systems (UAV) -- one that uses high power microwave (HPM) to disable the target and other that deploys a high energy laser (HEL) to disintegrate it. The two systems were put to test in a recent Maneuver Fire Integrated Experiment and were able to take out as many as 45 different drones out of the sky, along with a few stationary mortal projectiles, Popular Mechanics reported.