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
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Iranian Shots Down of RQ-170 Sentinel Stealth Drone: The Unanswered Question | Global Military Review
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Iran's New RQ-170 Sentinel Stealth Drone: Flight footage of Iranian version of US drone released - YouTube
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desarrollo defensa y tecnologia belica: Exclusive: Uniquely Configured RQ-170 Stealth Spy Drone Appears At Vandenberg AFB
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