None of them "blew any whistles". They had their chance at the hearing, and as always, any evidence that could actually convince the public was "classified" as if showing the public a clear picture of a crashed alien craft or body is some national security threat. One expert who was interviewed about the reason for secrecy said the claims that there would be "mass panic" or "security threats" if they revealed everything, were the "most absurd, unsubstantiated, idiotic claims ever" and that it doesn't make any sense for them to do it. So there is no reason to classify them. The truth is they probably have no evidence but want us to think they are hiding stuff so we fear them. There is not a shred of common sense, logical reasoning, or military gain on the planet, that would suggest concealing UFO evidence.
https://www.msn.com/en-us/news/opinion/michael-ian-black-ufo-whistleblower-david-grusch-is-my-hero-of-2023/ar-AA1m1Kqk?cvid=ce84b61e06f942f3b4ddbc6f0f2c3cea&ocid=winp2fptaskbar&ei=19&sc=shoreline