The Fat Leonard scandal is an ongoing investigation and prosecution of corruption within the United States Navy during the 2000s and 2010s. It has involved ship support contractor Glenn Defense Marine Asia (GDMA), a Thai subsidiary of the Glenn Marine Group. The Washington Post called the scandal "perhaps the worst national-security breach of its kind to hit the Navy since the end of the Cold War." The company's chief executive, president, and chairman, Malaysian national Leonard Glenn Francis, bribed a large number of uniformed officers of the United States Seventh Fleet with at least a half million dollars in cash, plus travel expenses, luxury items, parties and prostitutes, in return for classified material. The classified information included the movements of U.S. ships and submarines, confidential contracting information, and details about active law enforcement investigations into Glenn Defense Marine Asia.

Ted N. "Twig" Branch retired as a vice admiral in the United States Navy on 1 October 2016, after serving the last three years of his 37-year career as the Deputy Chief of Naval Operations for information warfare. In that capacity, he was the resource sponsor for the N2N6 portfolio which includes program investments for assured command and control, battlespace awareness, and integrated fires. He was the Navy's Chief Information Officer, the Director of Navy Cybersecurity, the leader of the Information Warfare Community, and the Director of Naval Intelligence. Branch was questioned by the Department of Justice regarding the Glenn Defense Marine Asia investigation in November 2013 and his access to classified information was suspended by the Secretary of the Navy. After a three-year investigation, Branch was cleared of all charges.