In popular culture
"Q" Clearance was a 1986 novel by Peter Benchley, satirizing Cold War secrecy and politics.[9] [10]
In "Nellis", episode 7 of season 6 of the television show Archer, Sterling Archer uses Q clearance to gain access to Area 51 after landing illegally on the airstrip.[citation needed]
The QAnon conspiracy theory is named such because the 4chan poster who created the conspiracy claims to be an indivual with Q level security clearance.[11]
https://en.wikipedia.org/wiki/Q_clearance
That episode of Archer aired on February 19, 2015, not long before Pizzagate and then QAnon. I wonder if the phony behind QAnon got the idea from this series?
https://en.wikipedia.org/wiki/Archer_(2009_TV_series)
That clearance has to do with nuclear materials. Q never put (I'm using the past tense because he's gone) himself in a position where people could actually ask him questions, so he never had to prove he knew anything about the DoE or nuclear materials. His areas of expertise seemed to be pedophilia and cannibalism.