Does anyone know anything about a Colonel Ross Stillwell?

I asked Snapchat AI about David Grusch and he had no information about him so I described him to the Ai and he gave me something about a “Colonel Ross Stillwell”?

I have not been able to find anything on him or anyone by that name who’s still alive. Yet the AI said he was the one testifying informó of congress last year?? I’m very confused.