Whistleblowers complained that accusations against supervisors in the Office of Resolution Management, Diversity, and Inclusion were ignored.
Lawmakers voted to subpoena information from the department for the first time since 2016.
The gear aims to limit the potential risk to pilots and other aircrew amid a recent spike in lasing incidents.
Whistleblowers reached out to Congress to report “unwarranted sexually suggestive and aggressive messages" from a senior manager.
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