An FBI memo from March 22, 1950, alludes to three flying saucers recovered in New Mexico.
This memo also states that it was believed that a radar station interfered with the saucers' control mechanisms causing them to crash. A retired marine sergeant stated that "C" band radar interfered with the saucer's flight control.
If this is true, then such a discovery would suggest the idea of a weapon that could be used to bring saucers down.