The USAF led NATO action in Bosnia with no-fly zones (Operation Deny Flight) 1993–96 and in 1995 with air strikes against the Bosnian Serbs (Operation Deliberate Force). This was the first time that USAF aircraft took part in military action as part of a NATO mission. The USAF led the strike forces as the NATO Air Force (otherwise mainly composed of RAF and Luftwaffe aircraft) with the greatest capability to launch air strikes over a long period of time. In 1999, the USAF led NATO air strikes against Serbia during the Kosovo War (Operation Allied Force).