Charles Hall spent two years at Nellis AFB as a weather observer during which time he interacted with extraterrestrials who were tall and white (Orions?) and a group of Greys from Roswell (Zeta Reticulans). I can’t import his recent interview given on Australian TV, which you can find here, but here is an older two-hour interview from Youtube in which he discusses his experiences.
The older interview is given at a talk especially for people interested in the topic, but the shorter interview above it is on Australian TV so a much broader audience listened to Charles on that one. Discussing the interactions of the American military with two species of galactic beings on national television? Uhhhhh, we are getting there! Thanks to Geoff West.