Built to deter America's enemies for the next 60 years, the Navy's new missile sub is slated to be the U.S. military’s third most-expensive program — ever.
AI has moved from the movies to the laboratory, and governments around the world want it in their arsenals. We asked how militaries define it, and how they intend to keep it under control.
Here’s how Western-backed Iraqi soldiers helped break the Islamic State’s grip on a city of more than 1 million people — and what we can learn from it.