Many Vietnam war veterans have come forward since the fierce fighting officially ended in 1975, including high ranking military officials, claiming to have spotted UFOs of alien origin. The most reputable claimer is Captain George Filer III, who worked for the US secret service in Vietnam, who says he saw the UFOs interacting with the US’s jets. He claimed: “One of our planes flew at about 500 knots, and suddenly a UFO appeared and circled the aircraft several times before it flew off at three times the speed of our Air Force jets. “It is a technology that is far superior to ours.”

GETTY Were aliens involved in the Vietnam war?

GEORGE FILER Captain George Filer III: "Suddenly a UFO appeared"

Since his retirement from the military and with his experience in UFO sightings, Captain Filer dedicated his life to extraterrestrial activity, running the website National UFO Center. But Captain Filer is not the only person to have seen UFOs that are not of this Earth during the ill-fated Vietnam war. Pete Mazzola, who served in the Vietnam war from 1965 to the end of the decade said before his death in 1987 that he saw UFOs during the conflict.

GETTY There are many reported sightings of aliens during the Vietnam war

He said: “There were several times, while on patrol in the jungle, that I had time to look up at the stars. “I saw more than a few unusual ‘shooting stars’ that manoeuvred in a way no meteor could.” In one incident, Mazzola and his squad saw a UFO hovering over paddy fields and palm trees where they were pinned down.

GETTY “It is a technology that is far superior to ours.”

He said: “I couldn’t believe what I saw. The other guys saw it too but afterwards were too shocked to talk much about it except to say, ‘What the hell was that?’” Another witness, General George S. Brown, says the alleged UFOs caused confusion among allies. Gen. Brown said: "I do not know if this story was ever told. They were not called Ufos. They were labelled as enemy helicopters.

Proof of aliens? These are signs that 'prove' we are not alone Wed, August 16, 2017 MIND-BLOWING signs that aliens exist. Play slideshow Getty Images 1 of 13 The Crop Circles are often believed to be created by aliens, as there is no proper explanation behind this phenomenon.