"Details of some US nuclear missile bunkers in Europe, which contain live warheads, along with secret codewords used by guards to signal that they’re being threatened by enemies, were exposed for nearly a decade through online flashcards used for education, but which were left publicly available... The flashcards 'detail intricate security details and protocols such as the positions of cameras, the frequency of patrols around the vaults, secret duress words that signal when a guard is being threatened and the unique identifiers that a restricted area badge needs to have'... Merely googling “PAS” (protective aircraft shelter), “WS3” (weapons storage and security systems) and “vault” (the US military term for nuclear weapons bunkers) together with the names of US Air Force stations in Europe came back with flashcards used in training and hosted on websites Chegg, Quizlet, and Cram..." https://www.theregister.com/2021/05/28/flashcards_military_nuclear/
