A Department of Homeland Security memo from June, describing the Pentagon’s findings, said that the group, publicly known by the nickname Salt Typhoon, “extensively compromised a U.S. state’s Army National Guard network” from March 2024 through December 2024. The memo did not specify which state was affected.

Going forward, all U.S. forces must now assume their networks are compromised and will be degraded,” a former Air National Guard servicemember said.

Chinese hackers stole network diagrams, credentials, and personnel data in a breach that poses a threat to critical infrastructure nationwide.