A bizarre UFO shaped like a sharp sliver of blue metal hovered over Wright-Patterson Air Force Base in Dayton, Ohio and was caught on a 13 minute-long video as it floated then vanished or became invisible.

The base was once the headquarters to Project Bluebook, the controversial US Air Force study that infamously concluded most UFO sightings were a form of mass hysteria or tall tales fabricated by psychopathological persons. Project Bluebook lasted from 1947 to 1969.

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There have been numerous UFO sightings over Wright-Patterson since the end of World War II.

The stunning video of the sighting shows the UFO floating in the air with its sword-like tip pointed towards the base. It also revealed strange markings along the hull of the UFO.

The woman taking the video on her mobile phone is heard saying, "What the f*** is that?"

She then exclaims, "It looks like it's moving with the clouds."

She zooms her camera for a closer look but the UFO heads into the clouds and disappears.

"Oh my God, it f****** disappeared," said someone.

The woman that took the video sent it to "Secure Team 10," a group of UFO investigators that describe themselves as "the research team bringing exposure of the alien phenomenon and those trying to hide it back to the masses!"

This group alleges the same UFO was seen two other times over Dayton.

"It's the same UFO. I am simply amazed, we have someone corroborating this sighting," said Tyler Glockner of Secure Team 10.

Glockner said he has no doubt "this is either an alien craft or a very, very strange drone, which I highly doubt." He also said the UFO could be a captured alien spacecraft being tested by the USAF.

You can watch the UFO video on YouTube here.

TagsUFO, Wright-Patterson Air Force Base, Project Bluebook, US Air Force