Related by context. Frequent words. (Click for all words.) 72 radars 65 radar screen 64 Radar 55 radar screens 45 Doppler radar 44 UAV 44 unmanned aerial 43 unmanned aerial vehicle 43 UAVs 42 unmanned aerial vehicles 42 unmanned aircraft 41 satellites 41 reconnaissance 41 airborne 40 spy satellites 40 surveillance 40 AWACS 40 autopilot 40 infrared 39 aerial surveillance 39 reconnaissance aircraft 39 infra red 39 reconnaissance missions 39 RADAR 39 fighter jets 39 Global Hawk 39 LIDAR 38 unmanned drones 38 electronic warfare 37 periscope 37 blimp 37 copter 37 unmanned 37 unmanned surveillance 37 satellite 37 microscope 36 ionosphere 36 GPS 36 fighter jet 36 drones 36 searchlight 36 Global Positioning System 36 decoys 36 interceptor 35 Infrared 35 thermal imaging 35 infrared cameras 35 Satellites 35 aircraft 35 telescope 35 infrared camera 35 seismometers 35 infrared sensors 35 sonar 34 electro optical 34 helicopter 34 VHF 34 horizon 34 watchlist 34 FLIR 34 spotters 34 unmanned drone 34 Unmanned 34 beacons 34 keeping tabs 34 altimeter 34 GPS satellites 34 Airspace 34 airspace 34 plane 34 laser guided 34 transponder 33 missile 33 fighter bombers 33 avionics 33 Super Hornet 33 antennae 33 collision avoidance 33 copters 33 UFO 33 interceptor missile 33 reflector 33 Fighter jets 33 airfield 33 fighter planes 33 Drones 33 supersonic 33 MiG 32 drone 32 USAF 32 altitude 32 choppers 32 tracking 32 airships 32 interceptors 32 NORAD 32 watchful eye 32 detectors 32 blips 32 GPS tracking 32 night vision goggles