A top-secret document has been put in the storage compartment in 1997, revealing that the US Air Force used to design and manufacture
The US military has just launched a competitive product in the drone market.
Weighing about 350g and a diameter of 16 inches, the ball can travel in many directions with high stability, while the maximum speed can be up to 60km / h.
Russian aviation designers say the Russian Air Force will have a new airship, shaped like a flying saucer, as seen by UFO researchers.