Benjamin Pierce Bishop, a retired U.S. Army lieutenant and former Hawaiian defense contractor for the U.S. Pacific Command, gave classified information to a Chinese woman he was having a romantic relationship with. The information he shared contained data on U.S. nuclear weapons capabilities, and also training and planning sessions between the U.S. and South Korea. Arrested in March 2013, Bishop was sentenced to seven years in prison in 2014.
(From: https://www.washingtontimes.com/topics/benjamin-pierce-bishop/)