Unclaimed is a 2013 Canadian documentary film about a man who claims to be former Special Forces Green Beret Master Sgt. John Hartley Robertson, who was declared dead after being shot down over Laos on a classified mission on 20 May 1968. The documentary is written, directed, and produced by Michael Jorgensen. It follows Tom Faunce, a veteran of the Vietnam War, in tracking down the man who claimed to be Robertson. Faunce was skeptical of Robertson's identity but eventually became convinced. He convinced Jorgensen to make a documentary about Robertson's story as a way to unite the man with his American family.

Leading up to the film's release, the validity of Robertson's identity was challenged by groups of Vietnam War veterans and groups that advocate the Vietnam War POW/MIA issue. Jean Robertson-Holley, Robertson's surviving sister, was convinced the man was her brother but initially declined DNA testing as unnecessary. Eventually she and her daughter (Robertson's niece) Gail Metcalf expressed openness to going through with testing. The documentary was screened at the Hot Docs Canadian International Documentary Festival on April 30, 2013. A day later, The Independent reported the contents of a memo from a 2009 report by the Defense Prisoner of War/Missing Personnel Office that the man who claimed to be Robertson was actually Dang Tan Ngoc, "a 76-year-old Vietnamese citizen of French origin who has a history of pretending to be US army veterans".