Gary McKinnon and what he says he saw is oooooold news. Like, a decade.
He was using VNC over dial-up and was too stoned to take screen grabs. Make of that what you will - start with compression artifacts.
That said, "non-terrestrial officers" always got me wondering about just how demilitarised space is. Hiss assertion that he kept bumping into other unauthorised users crawling round the same networks hasn't exactly been disproved by later events either.