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The United States Air Force has disciplined 15 personnel following a leak of classified military information, allegedly by Air National Guardsman Jack Teixeira.

Prosecutors have accused Teixeira, who was 21 at the time of his arrest in June, of sharing classified documents with a group of gamers on Discord, including sensitive details about the US military’s activities in Ukraine.

Described as the most significant US national security breach since the WikiLeaks incident in 2010, this leak prompted a range of disciplinary actions. In a statement, the Air Force said, “The actions ranged from relieving personnel from their positions, including command positions, to non-judicial punishment under Article 15 of the Uniform Code of Military Justice.” Among those disciplined was Colonel Sean Riley, commander of the 102nd Intelligence Wing, which Teixeira was part of, who was relieved of his command.

An inquiry by the Air Force Inspector General discovered that members of Teixeira’s unit had knowledge of “as many as four separate instances of his questionable activity.” Additionally, a few individuals who had a more comprehensive understanding of his intelligence-seeking behavior “intentionally failed to report the full details of these security concerns/incidents.” The report emphasized, “Had any of these members come forward, security officials would likely have facilitated restricting systems/facility access and alerted the appropriate authorities, reducing the length and depth of the unauthorized and unlawful disclosures by several months.”

The Air Force also clarified that there was no evidence found indicating Teixeira’s chain of command knew of his alleged disclosures.