Some UFO investigation groups reckon that the triangle shaped UFO's are USA ships that they have been using to fly to Mars, I think that it is possible that some would be used by the USA, but within strict rules by there grey masters, most likely that most individuals involved are originally not of this world.
I think, and it is quite a common theory, that the people who have experienced radiation burns from close up sightings, was from USA experimental UFO's.
