https://www.youtube.com/watch?v=j-G9YDNgAIQ

Why The U.S. Air Force Loves New Stealth DronesAmerican unmanned aerial vehicle (UAV) developed by Lockheed Martin and operated by the United States Air Force (USAF) for the Central Intelligence Agency (CIA). While the USAF has released few details on the UAV’s design or capabilities, defense analysts believe that it is a stealth aircraft fitted with aerial reconnaissance equipment. Introduced in 2007, it has been deployed to Afghanistan in late 2007, and to South Korea two years later, in September 2009. Some images and details of the aircraft were released after Iran captured an RQ-170 in 2011. It has a flying wing design, and uses a single engine, speculated to be either a General Electric TF34 turbofan or a Garrett TFE731.On 4 December 2011, media reports stated that the Iranian Army’s electronic warfare unit had downed an RQ-170 that violated Iranian airspace along its eastern border through overriding its controls, and had captured the lightly damaged UAV. On 6 December, U.S. officials acknowledged that a drone crashed in or near Iranian airspace and that it belonged to the CIA, and not to the International Security Assistance Force (ISAF) as was earlier stated by the US government.The Iranian government released footage of a captured RQ-170 on 8 December. After examining the video that same day, U.S. officials confirmed that the drone was genuine. In April 2012, General Amir Ali Hajizadeh, the commander of the Islamic Revolutionary Guard Corps aerospace division, claimed that Iran had reverse-engineered the RQ-170, and was building a copy of the UAV. He also stated that data was being recovered from the captured RQ-170. The semi-official Tasnim news agency of Iran reported in September 2016 that a UAV named Saegheh-2, similar in appearance to the RQ-170 Sentinel, had been built. It was said to be able to carry four precision-guided bombs; the range was not stated. The Shahed 171 Simorgh is also based on the downed Sentinel.