Men and women who have taken to the air on behalf of the United States expressed bewilderment after the leak of attack plans.

The military takes extraordinary measures to keep combat operations secret, cutting off outside communications for service ...

The Space Force enjoyed a meteoric rise in its budget from the last year of Trump's first term in the White House through ...

A guide from the national intelligence director’s office says “information providing indication or warning that the U.S. or ...

After more than a decade of mapping the stars, the European spacecraft was shut down on Thursday. But its legacy lives on.

There are computer systems designed to discuss war plans and other secrets. They are accessible only in secured rooms, and it ...

Democrats on a House committee appeared in lock step as they confronted one of the most notable blunders of the Trump ...

The messaging app Signal has become more popular in recent times because of Salt Typhoon, a Chinese operation that ...

President Trump and his aides mounted a defense Wednesday of the administration’s accidental release of missile attack plans ...

The often bureaucratic nature of classified information is complicated, with different levels of secrecy and different ...

Secretary of State Marco Rubio said no “war plans” had been divulged in the group chat in which he took part. Chat texts ...

The chat’s contents, which were obtained by The Atlantic after its editor in chief was added to the Signal group, provide a ...