Jack Teixeira, the Massachusetts Air National Guard member who caused an international uproar when he leaked highly classified documents about the war in Ukraine, pleaded guilty to military charges of obstructing justice at his court-martial Thursday and called himself a “proud patriot.

Jack Teixeira, a member of the Massachusetts Air National Guard who is serving a 15-year prison sentence for leaking classified U.S. national security documents online, was sentenced by a military judge to a dishonorable discharge on Thursday after pleading guilty to obstructing justice.