The Air Force said it disciplined 15 airmen – some of them losing their command – for not acting properly when they learned of accused leaker Jack Teixeira’s activities to get intelligence, based on a wide Air Force investigation that came out Monday.

But that watchdog report said there was no proof that Teixeira’s direct bosses knew then that he was allegedly leaking some of the nation’s most secret information online.

The report shows a lack of oversight by Air Force officials at Teixeira’s base.

That helped him to allegedly collect and then leak secret documents without being found, even though other airmen saw he was wrongly getting the sensitive materials, which were not part of his IT work, the report says.

The Air Force said the 15 service members, from staff sergeant to colonel, lost their positions and got non-judicial administrative punishments.

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The Justice Department’s criminal investigation that led to Teixeira’s indictment on six charges of keeping and sending national defense information is different from the internal review.

ABC News has reported that he is accused of leaking highly secret materials on Discord – a popular online platform – to a small group, but the records later spread much more widely.

Teixeira said he was not guilty and is waiting for a trial date.

The Air Force inspector general had to review the environment around Teixeira, an airman 1st class, and how the 102nd Intelligence Wing at Otis Air National Guard Base in Massachusetts followed policy, procedures and standards after his arrest in April. Teixeira was an IT specialist there.

The internal investigation blames Teixeira for the illegal leak of secret information, but it also found that his unit members did not do what they had to do, such as checking areas under their command well and giving clear guidance for reporting security issues.

The watchdog report also said the “need to know” concept was not clear, where people with a top security clearance, like Teixeira, could get sensitive secret information, even though he did not need that information for his IT work.

The review also said his unit’s leadership did not check the behavior of all people under their command.

“Every Airman … has the serious duty to protect our nation’s secret defense information. When someone breaks that trust, for any reason, we will follow our laws and policies to make them answer for it,” Air Force Secretary Frank Kendall said.

“Leaders at every level have to protect important assets, so they do not get to those who would hurt the United States or our friends and partners,” Kendall said.