According to a Fox News report, the U.S. Air Force has acknowledged that it is developing and testing a new, unmanned aerial vehicle (UAV).

The stealth UAV will primarily be used for military reconnaissance and surveillance missions.

Major Cristin L. Marposon, a public affairs officer for the USAF at the Pentagon, told FoxNews that the aircraft was built by defense contractor Lockheed Martin's Advanced Development Programs.

The so-called " low observable UAV is designated RQ-170 Sentinel.

Gizmodo had earlier posted images of a "secret plane" on its site. Looks like it's a secret no more.