It recently emerged the Pentagon has been secretly running a multi-million pound program investigating UFOs for years.
Video has also been leaked showing two US pilots checking on strange aircraft in the Pacific Ocean around 100 miles from San Diego, which first appeared at 80,000ft.
He said: “Are UFOs chasing our jet fighters, as recent secret documents suggest?
“Maybe they are experimental hypersonic drones. Or maybe aliens from outer space? I keep an open mind.”
Ballistic missiles called “hypersonic glide vehicles”, or HGVs, which are capable of striking anywhere in the US in less than an hour are being developed by the People’s Liberation Army (PLA).
They can deliver nuclear payloads a ultra high speeds within a matter of minutes, leaving defence systems helpless.
Russia has claimed its 16,000mph hypersonic nuke missiles could be ready for operation in two years.
Eerie ALIEN ship on the Lunar Surface
He has thrown his support behind former Pentagon official Luis Elizondo who led the top-secret £16 million Advanced Aviation Threat Identification program.
Speaking about his encounter Mr Fravour said: “It was a clear day with a blue background and it was perfectly white.
In a stark warning to governments he said: “We all need to take these seriously as a species, because right now we don’t know the intent of these things, if they’re like ET it’s great, if they’re like War of the Worlds not so much.”