Counter UAV (Unmanned Aerial Vehicle) system, comprising sensors for the detection of UAVs, electronic apparatus for processing and evaluation of sensor data and jammers for performing electromagnetic countermeasures against the detected UAVs; counter-drone system comprised of proximity sensors, electronic controllers for drones, and electronic devices for locating drones using radio frequency, optical, thermal, acoustics, and human observation; drone countermeasures systems, namely, radio transmitters for use as radio frequency jamming devices, laser dazzlers, and directed energy weapons in the nature of infrared lasers capable of delivering significant thermal energy at a distance, high powered microwave and RF transmitters capable of disrupting radio receivers and other electronic devices, and visible lasers capable of temporarily and/or permanently disrupting optical sensors; Unmanned aerial system (UAS) defeat system in the nature of a counter-drone system composed of a multi-spectral avionic sensor system comprising radio frequency, acoustic, radar, and imagery sensors, electronic controllers for sensors, and electronic devices using cyber electromagnetic activity to detect, identify, and disable UAS in the nature of drones; recorded and downloadable computer software for the detection, tracking, alerting and interdiction of drones and unmanned aerial vehicles; computer hardware and recorded and downloadable software for the operation of counter-unmanned aerial intelligence and defeat systems