UK Daily Mail 
Monday, March 23, 2009
A flurry of UFO sightings was troubling the spooks at the Ministry of Defence.
Hundreds had been reported, by everyone from RAF pilots over Scotland to a woman walking her dog in Norfolk.
But it wasn’t the threat of an alien invasion that tormented defence officials during this period of overhead hyperactivity at the end of the 1980s.
The sleek shape of the B2 Stealth bomber
Their theory was that our American allies had been building and testing stealth aircraft and spy planes without telling us.
In fact, in many cases they were probably right.
A series of simple, almost childish drawings produced by some of the witnesses have just been released from secret files.