I can hardly believe that the B-1B—the U.S. Air Force's four-engine supersonic, sweep-wing strategic bomber—is 30 years old. It still looks like an aircraft from the distant future. This one was photographed over Iraq after conducting air strikes in Syria against ISIL targets, on the 27th of September 2014.

How Stealth Works

Stealth bombers are not invisible—far from it, in fact. The Northrop Grumman-designed B-2 Spirit has a hard-to-ignore 175-foot wingspan and a thin, disk-like silhouette that makes it look like a cross between a stingray and an alien craft from a summer blockbuster.