Most missions have coded phrases you can use to indicate UO over open channels.
“There is a Santa Claus” was one used on one Apollo mission.
John Podesta did a forward to a book recently published called “UFO” that documented six cases. These six are from as unimpeachable sources and witnesses as you can find.
The issue within government right now isn’t that they exist. Understanding whether they are under intelligent control is where they are at today. The approach is of high skepticism and the unwillingness to make assumptions now.
There’s plenty of scientific evidence to indicate the existence of UAO’s. That’s where it stops, however. There isn’t enough evidence to conclude how they are powered, whether they are piloted or remote controlled, etc.
Most AF and Naval Academy cadets receive instruction on UAO’s and how to report them, for example.
The government has known for 60 years. They're terrified at public reaction to the eventual revelation. Organized religion would certainly get a workout, in both directions.