It's not clear how many independent sources this actually reflects. All that we, as members of the general public, have to go by is a low-quality video, and a bunch of "soandso said that soandso said that soandso saw..."-type reports that involve a chain of "soandso"s not selected for critical thinking (news media, congresspeople) and ending in people that all belong to the same command structure (the US military), which could have any number of reasons, some enumerated downthread, to order them to report independently having seen something - or, even more straightforwardly, to have standing orders that prevent individual personnel from coming forward and saying that to their knowledge no such thing happened if whoever the higher-ups tasked with talking to the media pulled the statement that hundreds of members of the crew independently saw the UFO out of their rear end.