RQ-170 Sentinel

With An Estimated Wingspan Over 20 Meters, The Ability to Fly At Altitudes Above 15,000 Meters, And Designed For Stealthy Deep Surveillance Missions In Hostile Airspace, A Secret U.S. Drone Operated Silently For Years, Disappeared On A Sensitive Mission In 2011, And Exposed The Risks Of Invisible Aerial Warfare