A B-21 Raider under cover before being unveiled in Palmdale, California on December 1.

US Air Force/Airman 1st Class Joshua M. Carroll

On December 2, the US Air Force unveiled the B-21 Raider, its first new bomber in over 30 years. Very little is known about the B-21's capabilities, and US officials plan to keep it under wraps. But it may be most valuable not for what it can do now but its ability to stay relevant for decades.

What is the best feature of the B-21 Raider? It may not be the new...

Continue Reading 34 years after unveiling the iconic B-2, the US military has revealed a new bomber designed to use weapons that haven't been invented yet