Exactly what shape that fighter should take has been an ongoing debate, with some critics—most notably, perhaps, Elon Musk—questioning whether manned jets have a future at all. Amid this cloud ...

The U.S. is spending billions on advanced AI drones. That effort will forever change fighter jets' role in American defense. But the upshot for defense firms is complex.

Elon Musk says China wants assurances that the rare-earth magnets needed to build Optimus won't be used for "military ...