WASHINGTON (CNN) -- A Navy admiral engaged in sexual relations in the White House in 1990 with a federal employee whom he falsely told he was a widower, according to a report released Friday by the Defense Department. In March, when the report was submitted to Pentagon officials, Rear Adm. John Stufflebeem was demoted and fired from his post as director of the Navy staff. Stufflebeem told investigators he couldn't remember the name of the woman he had an affair with. He also lied when he told investigators he did not engage in sexual relations with the woman, identified as...