The US airman accused of leaking confidential intelligence and defence documents has been officially charged in a court appearance in Boston.
Jack Teixeira, 21, wore shackles and a prison uniform as he stood before a federal judge on Friday.
After a shout of "love you, Jack" from a person in the courtroom, the defendant replied "you too, dad".
Mr Teixeira faces up to 15 years in prison over charges of unauthorised transmission of defence information.
He is also charged with the unauthorised removal and retention of classified documents.
The airman faces up to 10 years in prison for the first charge, and up to five years in prison for the second.
The dozens of leaked documents had revealed US assessments of the war in Ukraine as well as sensitive secrets about American allies.
The leaks embarrassed Washington and raised fresh questions over the security of classified information.