Why did the US Air Force's RQ-170 Sentinel stealth reconnaissance drone have a grill covering its engine inlet instead of using an inlet like the B-2 Spirit? - Quora
RQ-170 Sentinel: The U.S. Military's Top Secret Stealth Drone - 19FortyFive
Iranian Copy of U.S. Unmanned Stealth Aircraft is a Fake - USNI News
The RQ-170 Sentinel Spy Drone | Visual.ly
US Deployed RQ-170 Stealth UAV To Spy On Russian Military Positions In Crimea; Mirage-2000s Also Used For Covert Ops
Exclusive: Uniquely Configured RQ-170 Sentinel Photographed At Vandenberg AFB
Lockheed Martin RQ-170 Sentinel - Wikipedia
Did Iran Capture a U.S. Stealth Drone Intact? | WIRED