Guide to U.S. military drones The MQ-9 Reaper drone brought down by so-called Russian “coercive signalling” – limited military action, short of direct aggression – is one of the formidable range of U.S. crewless aircraft General Atomics MQ-9 Reaper Armament: Up to 16 Hellfire missiles or four missiles and two laser-guided bombs Unit cost: $30 million Max altitude: 15,240m Range: 1,850km Endurance: 32 hours Remote crew: Two, pilot and sensor operator Targeting system General Atomics MQ-1C Gray Eagle Armament: Up to four Hellfire missiles Unit cost: $10 million Max altitude: 7,620m Range: 4,600km Endurance: 27 hours Remote crew: Two Hellfire AGM-114 air-to-ground missiles with range of 11km General Atomics MQ-1 Predator Armament: Two Hellfire missiles Targeting System: Infrared sensor, daylight and image-intensified TV, laser designator and laser illuminator Unit cost: $5 million Max altitude: 7,620m Range: 1,240km Endurance: 24 hours Remote crew: Two Northrop Grumman RQ-4 Global Hawk Unarmed surveillance aircraft Unit cost: $90 million Max altitude: 18,000m Range: 22,780km Endurance: 34+ hours Remote crew: Three Sources: General Atomics, Northrop Grumman, RAND Corporation © GRAPHIC NEWS