The key word is “claims”.
The reason all these "whistleblowers" have is "claims" is because the DOD is refusing to be honest with the American people about whatever evidence they have.
BTW, Admiral Gallaudet knows there's evidence because pilots interacting with UFOs and UAPs have had to scrub missions because of them. Some of these missions are very compressed (timewise) pre-deployment exercises of carrier groups and scrubbing air training missions because of UAP interference is a very big deal.
This did happen to the carrier USS Roosevelt as it was preparing for deployment to the ME. The DOD grabbed all the records, classified them, and then tried to deny it happened...even to the officers, pilots, and seamen involved.
The same danger applies to civilian and commercial aircraft but the DOD slams the door shut on this matter.
That's why whistleblowers are coming forward and hearings are being held.