In 2019, what began as a joke by a 21-year-old vape kiosk worker quickly spiraled into a national security headache.

Military social media is buzzing with memes about officials' use (or misuse) of Signal. Trump officials mistakenly added a journalist to a Signal chat on military operations.

Military social media is buzzing with memes about officials' use (or misuse) of Signal. Trump officials mistakenly added a journalist to a Signal chat on military operations.