Listen to the 911 call that dude was not stumbling or mumbling he was very clear. When the cops pulled up they saw a blue light flying in the sky. Area 51 is in Nevada so the aliens were probably checking in with the Air Force. The caller said:
"they're 9 feet, 10 foot...I don't know, they look like aliens to us...they have big eyes...I can't explain it and a big mouth...shiny eyes, they're not human"
Do you believe in extraterrestrials?