“A secret U.S. surveillance drone that went missing last week in western Afghanistan appears to have crashed in Iran, in what may be the first case of such an aircraft ending up in the hands of an adversary.
Iran’s news agencies asserted that the nation’s defense forces brought down the drone, which the Iranian reports said was an RQ-170 stealth aircraft. It is designed to penetrate enemy air defenses that could see and possibly shoot down less-sophisticated Predator and Reaper drones.”
Source:Iran says it downed U.S. stealth drone; Pentagon acknowledges aircraft downing – The Washington Post