As in the inhabitants of those law enforcement, paramilitary, military & similar organization of this new Boiling Isles government (based on Covens Against the Throne successor) trained by USA to deal with ancient threats. Inspired by this Tactical Breach Wizards video game https://www.youtube.com/watch?v=ILThlN_-uGg
TBH the Collectors are more alien & seem to be some space travel civilization in a more 'magical' method.
"Alien Confused As Earth Leaders Try To Explain All The Human Genders" by The Babylon Bee
https://www.youtube.com/watch?v=enisdXlVhzE