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Robert Hunter Biden, right, with his father Joe, US Vice President, and US President Barack Obama Image Credit: joeforamerica.com

Washington: Robert Hunter Biden, the youngest son of Vice President Joe Biden, has been kicked out of the military this year after testing positive for cocaine, a US official confirmed on Thursday

Robert Hunter, 44, was discharged this year from the US Navy reserve.

He had been a reserve officer starting in 2012 but failed the drug test last year, said the official familiar with the case, who spoke on condition of anonymity.

In a statement, the vice president's younger son acknowledged his discharge and expressed regret.

"It was the honour of my life to serve in the US Navy, and I deeply regret and am embarrassed that my actions led to my administrative discharge," he said in the statement, issued through his lawyer.

Moving forward

"I respect the Navy's decision. With the love and support of my family, I'm moving forward."

There was no public response from the vice president's office.

Robert, who held the rank of ensign, had been selected for a commission in 2012 and assigned to a unit in Norfolk, Virginia to work in public affairs. He was discharged from the naval reserves in February 2014, according to a US Navy spokesman.

The details of Biden's discharge could not be released under the provisions of privacy law, Commander Ryan Perry said in an email.

The expulsion was first reported by the Wall Street Journal.

Biden had been 42 when he applied for his commission in the reserves, and because of his age he had to obtain a waiver.

The Journal reported that he needed a second waiver because of a drug-related charge that he received when he was younger, which officials say is not uncommon.

The news of his s discharge follows a series of embarrassing incidents for the US vice president, who recently had to apologise to Turkey and the United Arab Emirates after he said they had financed Sunni jihadists.

The vice president's other son, Beau, is the attorney general of Delaware, where he is standing as a candidate for governor. Beau Biden is a major in the Delaware National Guard.