The manual uploaded by the War Thunder player has a restricted status, so it’s not supposed to be distributed online in any way whatsoever – something the user apparently didn’t know about, since they themselves found it online.

So many workers are bombarded with test phishing emails from IT and constant reminders and training about data security etc over data that isn't national-security-level classified. How tf do people keep accidentally leaking such classified info? Do you think it's people who grew up reading spy novels during the cold war regretting that they never became a double agent? They just decided to live their best life and while they don't know who to leak classified docs with, by god they're going to share them with someone.