 F-117s took part in the conflict in Yugoslavia, where one was shot down by a surface-to-air missile (SAM) in 1999; it was the only Nighthawk to be lost in combat.The U.S. Air Force retired the F-117 in April 2008, primarily due to the fielding of the F-22 Raptor.Despite the type's retirement, a portion of the fleet has been kept in airworthy condition, and Nighthawks have been observed flying in 2020.