A Queens, N.Y., man accused of impersonating a decorated Green Beret officer faces up to a year in prison after the feds busted him for wearing military medals he hadn’t earned — including a Purple Heart and Silver Star, The New York Post reported Tuesday.

The paper wrote that in order to dupe at least one military contractor into hiring him, Louis Lowell McGuinn, 63, masqueraded as a lieutenant colonel but was actually discharged as an Army private in 1968 after serving in Vietnam, prosecutors said Monday.

Based on his bogus credentials, the Post wrote, he was hired by underwater marine security company CodaOctopus USA for two six-month stints, according to the Manhattan federal court complaint.

The Post reported that McGuinn flaunted the medals at functions, including a military meet-and-greet at The Pierre Hotel, prosecutors said — until someone noticed that he was wearing his medals incorrectly.

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