Like cursed penguins, a whole barrage of helicopter designs has failed to make it. From advanced stealth helicopters that cost billions, to sleek gunships and vast flying cranes that proved too much, ...

The U.S. Air Force’s now airborne, yet highly secret sixth-generation stealth fighter jet; the new Ground-Based Strategic Deterrent intercontinental ballistic missile (ICBM); and the U.S. Army’s ...

As experts have gotten a look at photos of the pieces of a U.S. helicopter left behind at the compound where Osama bin Laden was killed, they've... As experts have gotten a look at photos of the ...