It was announced on the BusinessInsider website in May 2020 that Google had signed a a deal with the US Department of Defense to use its Cloud tools to combat cyber threats.
In a statement, Google said its cloud tech would be used "to detect, protect against, and respond to cyber threats worldwide," as part of the contract with the DoD's Defense Innovation Unit (DIU).
The company faced backlash from employees for its last partnership with the Pentagon called Project Maven. It would have used Google's AI and machine learning to analyze drone footage, but was abandoned in 2019 after thousands of Google employees signed a petition protesting the deal.
Reference:
Google is partnering with the Department of Defense to fight cybercrime (20 May 2020)