Bryan Minkyu Martin, a Navy intelligence specialist in Fort Bragg, was arrested December 2010 for taking top secret documents from military networks and offering to sell them to undercover a FBI investigator posing as a Chinese intelligence agent. He handed over several secret and top secret documents with information on military operations in Afghanistan and Iraq in exchange for money. In March of 2011, Martin pled guilty to four counts of espionage; and on May 20th he was sentenced to 48 years in prison.
(From: https://books.google.com/books?id=3zSSCgAAQBAJ&lpg=PA159&ots=kN-cvcTp94&dq=bryan%20minkyu%20martin&pg=PA159#v=onepage&q=bryan%20minkyu%20martin&f=false)
The Counterintelligence Chronology by