A former Marine claims he and five comrades saw a flying saucer being loaded with weapons while serving in Indonesia in 2009 – and was threatened at gunpoint by unmarked US forces at the scene.

The wild story comes after an Air Force whistleblower from the government's UFO office joined growing numbers of intelligence officials claiming the US has recovered and is even reverse-engineering crashed or landed 'non-human' spacecraft.

Michael Herrera was a 20-year-old rifleman sent on a Navy humanitarian mission during the 2009 Sumatra earthquake and tsunami that devastated the region.

In an exclusive interview with DailyMail.com, he claims that while guarding an airdrop of aid supplies outside the city of Padang in October that year, his six-man unit stumbled across a hovering octagonal craft in apparent use by clandestine US forces.

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