The Massachusetts Air National Guard member convicted of leaking military secrets has been sentenced to 15 years in federal prison. 

Twenty-two-year-old Jack Teixeira of Dighton previously pleaded guilty to violating the Espionage Act. 

Teixeira admits that he posted classified military documents on the gaming focused social media site Discord. 

Prosecutors say the case is one of the most significant violations of the Espionage Act in U.S. history.