In what became known as 'Project Blue Book,' more than 12,000 encounters with UFOs were looked into by the Air Force.
Now, decades after the files were closed, the microfilms have been made available online for free – allowing anyone to re-examine the evidence.
The USAF says that the Blue Book included 12,618 sightings reports, with 701 of which remained 'unidentified' – or around 5.5 per cent of the files.
The files, which can be accessed here, were previously only available by visiting the National Archives in Washington, according to a report in openminds.tv.
'There is plenty of work for amateur investigators to try to come up with explanations they never had time to consider or research,' Nigel Watson author of the UFO investigations Manual told MailOnline.
One case that Mr Watson is particularly intrigued in for historical reasons is a report filed by Kenneth Arnold which led to the popular term 'flying saucers'.
Mr Arnold saw nine UFOs over Mount Rainier, on 24 June 1947 and the US government agencies took an interest in reports.
A similar sighting occurred over Tulsa, Oklahoma, just a month later on July 12, 1947
'They flew in a diagonal formation that stretched about five miles from the first to last craft, and they bobbed about erratically,' said Mr Watson.
'He estimated that they travelled faster than 1,000 miles per hour as they flew from Mount Rainier to Mount Adams.'
When describing the sight to newspaper reporters, Mr Arnold said it was 'like a saucer would if you skipped it across the water.'
This, said Mr Watson, reveals that the term flying saucer came from the description of the movement of the craft rather than their appearance.
'Explanations from mirages, secret aircraft to the flight of pelicans have all been used to try to explain his sighting but it still remains a mystery,' he added.
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