THE US has obtained crash wreckage from "non-human" UFOs which it has kept secret for decades, according to a new Pentagon whistleblower deeply involved in the probe.

David Charles Grusch - a former intelligence officer with top-secret clearance - even filed a legal complaint against the US Department of Defense (DoD) as he alleged a cover-up.

He stated in no uncertain terms that the US has in its possession fully intact and pieces of "craft" which have "non-human origin".

The veteran intelligence officer, who served in Afghanistan, claimed that the US has been collecting and attempting to reverse engineer this material for "decades".

Grusch described it as an "80-year arms race" - and added UFO wreckage has not just been found in the US, but worldwide.

"We are not talking about prosaic origins or identities. The material includes intact and partially intact vehicles," Grusch told The Debrief.

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"The existence of complex historical programs involving the coordinated retrieval and study of exotic materials, dating back to the early 20th century, should no longer remain a secret."

Grusch, 36, worked for the National Geospatial-Intelligence Agency (NGA) and National Reconnaissance Office (NRO).

He served as the NGA's representative to the Pentagon's UFO office - and later was...

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