An 88-year-old Bellevue man who faces loss of his citizenship and deportation as a possible war criminal has admitted in court documents that he belonged to a “despised” Nazi-run security unit during Germany’s occupation of Yugoslavia during World War II.Peter Egner insists in documents filed by his attorney that he committed no war crimes, but he has acknowledged serving as a transport guard on a train bound for Auschwitz, where he guarded a boxcar filled with Gypsy men, women and children targeted for extermination by the Nazis.Up until now, Egner has insisted he was nothing more than a soldier in the German army whose role in the war ended when he was shot and wounded in 1943. He now says he lied because he was “embarrassed” about his involvement in the security unit, according to the documents. The new federal court filings, including motions by both the government and Egner, contain hundreds of pages of wartime documents as exhibits, and ask U.S. District Judge James Robart to either dismiss the government’s lawsuit, or find that Egner lied about his activities and lacks the “good moral character” to be a U.S. citizen. The new records show Egner was first a soldier, and later a sergeant, in the Einsatzgruppen – later known as the “SD.”