The Sentinel is an unmanned aerial vehicle (UAV) developed by Lockheed Martin and operated by the United States Air Force (USAF). It has been deployed to Afghanistan as part of Operation Enduring Freedom.
The Sentinel was developed by Lockheed Martin’s Skunk Works as a stealth UAV. Journalists have noted design similarities between the RQ-170 and previous stealth and UAV programs such as the RQ-3 DarkStar and Polecat. It is a tail-less flying wing aircraft with pods, presumably for sensors or SATCOMS, built into the upper surface of each wing. Few details of the UAV’s characteristics have been released, but estimates of its wingspan range from approximately 65 feet (20 m) to between 75 feet (23 m) and 90 feet (27 m).