Washington (CNN) — The leading suspect in the leaking of thousands of military documents to WikiLeaks had been disciplined at least twice in the previous three years but maintained his security clearance. Pfc. Bradley Manning already was facing military charges for allegedly leaking a 2007 Iraq battle video to the WikiLeaks website and for downloading sensitive documents. Now, according to military sources, he is the lead suspect in the investigation into the leaked documents. But the recent incidents are not his first brushes with problems in the Army. CNN confirmed that during his training to become an intelligence analyst, Manning was reprimanded by commanders at Fort Huachuca, Arizona.”Manning, during advanced individual training, broke the rules and received a non-judicial punishment,” said Tanja Linton, a Fort Huachuca spokeswoman.She would not elaborate on how he broke the rules.Wired.com recently reported that he was punished for uploading videos on YouTube in which he talked about classified buildings at the base and classified materials he saw. Manning did not disclose classified information in the videos, but did discuss the rooms where secure information was held, which was considered a security risk.