Vedi: osservato un UAV nei Balcani

Unmanned aerial vehicles
http://www.iiss.org/pub/tx/tx00009.asp#uav

  Since unmanned aerial vehicles (UAVs) were last covered in The Military Balance 1996-97, technological developments have made them a more practical proposition. For example, the prototype US Global Hawk is built to stay on station conducting reconnaissance for up to 24 hours at a radius of 3,000 nautical miles. It made the first round-trip, non-stop, unescorted, unrefuelled UAV flight from the US to Europe on 10 May 2000.

  UAVs were brought into prominence during the 1999 NATO military campaign in Kosovo. The US Army Hunter, Navy Pioneer and Air Force Predator conducted important reconnaissance operations, with Predator becoming the first US UAV to designate a target for laser-guided bombs launched from an A-10 ground-attack aircraft. German and French CL-289 UAVs (Canadian designed) and the British Phoenix conducted target-acquisition and battle-damage assessment missions. NATO lost 20-30 UAVs during the 78-day Kosovo air operation. They were either shot down or suffered technical failure. In assessing these losses, a major factor to take into account is that no aircrew lives were put at risk. UAVs are also an important complement to satellites in information gathering, particularly in their ability to fly below cloud cover and ability to send real-time information when needed. Whereas reconnaissance satellites remain mostly the preserve of first-rank powers, UAVs can be an equaliser by offering immediate, independent imagery of comparable quality to a wider range of countries. For more data on operational UAV systems see the tabular information in The Military Balance 2000-2001.

Altri prototipi di UFO:
http://www.nurflugel.com/Nurflugel/Horten_Nurflugels/ho_ix/ho_ix.html