Regarding secrecy: a few years ago secret information got out because soldiers used flash-card apps to learn it, and those cards were released/available publicly.
https://www.bellingcat.com/news/2021/05/28/us-soldiers-expos...
https://www.bellingcat.com/news/2021/05/28/us-soldiers-expos...
I'm pretty sure most of it is unclassified, but some of it might not be public. The flashcards for security guard/MP stuff has some generic stuff like gate runner procedures, but they also have base-specific things such as where Department of Energy OST convoys carrying Special Nuclear Material or weapons would park on base during a Safe Haven unscheduled stop. There used to be one with an old sign/countersign I think.
The IT ones have information about where certain undersea cables and satellite ground stations are. The most sensitive stuff seems to be locations of infrastructure within a base. One of them mentions something about Building NH-95 at the Hampton Roads Naval base as being a critical site in the TS/SCI-classified network. Some of them also have the names of the officers responsible for certain programs that could be compromise targets.
https://quizlet.com/463959814/scif-flash-cards/
https://quizlet.com/547051333/knowperform-doe-vansafe-haven-...
https://quizlet.com/773174649/spec-op-flash-cards/
https://quizlet.com/761500482/isec-osi-308-310-flash-cards/
https://quizlet.com/519052943/setup-and-operate-the-kg-175d-...
Info: https://pdfhost.io/v/lMHgMiGTc_Joe_Mazzulla_scouting_notes_f...
Discussion: https://www.reddit.com/r/nba/comments/zn3149/joe_mazzulla_ha...