Mr Mellon had high-level clearance, was on a committee with oversight of all Department of Defence (DoD) special access programmes, spent a decade on the Senate Intelligence Committee and also work on classified projects at the Area 51 top secret US Air Force base in Nevada.
He is now part of the To The Stars Academy UFO research group formed by former Blink 182 singer Tom DeLongue, which has released a number of US military videos seemingly showing UFOs.
Mr Mellon said the unexplained craft in these videos could be proof of visiting aliens or that the Chines or Russians have developed far superior technology to the US.
Mr Mellon wrote that the government needs to do far more to investigate reports of unexplained objects flying around the sky.
Writing in The Washington Post ... Read even more
