The plot thickens. NPR reports this image was taken from a Pentagon-wide email circulated on 18 March. The headline says “Ahead of the Signal leak,” which is true and not: Goldberg was added on the 11th, the thread took place on the 13th, and the attacks were on the 15th — so this warning came three days later than the events, but six days before Goldberg’s story ran. That means it came after he started asking questions, which to my ear suggests this may well have been DoD bureaucracy (a) doing the right thing opsec-wise AND ALSO — because this kind of signaling and maneuvering is how bureaucracies work — moving to undermine the people involved in the chat.