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He added: "If the sightings are of devices not of earth then their purpose needs to be established as a matter of priority. There has been no apparently hostile intent and other possibilities are: (1) military reconnaissance, (2) scientific, (3) tourism."
The Wing Commander, whose name is blanked out in the documents, said the MoD could learn from the craft.
"If the reports are taken at face value then devices exist that do not use conventional reaction propulsion systems, they have a very wide range of speeds and are stealthy. I suggest we could use the technology, if it exists.
An inquiry, Project Condign, was eventually launched in 1996, apparently without the knowledge of then defence secretary Michael Portillo. It was completed in 2000 under Geoff Hoon.
The report found: "That (UFOs) exist is indisputable.
Credited with the ability to hover, land, take-off, accelerate to exceptional velocities and vanish, they can reportedly alter their direction of flight suddenly and clearly can exhibit aerodynamic characteristics well beyond those of any known aircraft of missile – either manned or unmanned."