A Pentagon-wide advisory went out one week ago warning against using the messaging app Signal, even for unclassified information. "A vulnerability has been identified in the Signal messenger ...

Several days after top national security officials accidentally included a reporter in a Signal chat about bombing Houthi sites in Yemen, a Pentagon-wide advisory warned against using the ...

The Pentagon's intelligence and law enforcement arms are investigating what it says are leaks of national security information. Defense Department personnel could face polygraphs in the latest ...

Elon Musk visited the Pentagon on Friday. But questions about why ignited a fresh storm of controversy surrounding his access ...