People watch a B-2 taxi on the runaway for its maiden flight in Palmdale, California on July 17, 1989.

Bob Riha Jr./Getty Images

On December 2, the US Air Force revealed its new stealth bomber, the B-21 Raider. Security was strict, with officials tightly controlling how much of the bomber was visible. That may have been an effort to avoid what happened the last time a stealth bomber was unveiled.

Security was tight when the US Air Force unveiled its new B-21 Raider stealth bomber on December...

Continue Reading A sneaky photo taken the last time a stealth bomber was unveiled shows why some parts of the new B-21 are still under wraps