 SR units are well armed, since they may have to defend themselves if they are detected as their exfiltration support needs time to get to them.During the 1991 Gulf War, British SAS and United States Army and Air Force Special Operations Forces units were sent behind enemy lines to find mobile Iraqi Scud tactical ballistic missile launchers, originally to direct air strikes onto them.When air support was delayed, however, the patrols might attack key Scud system elements with their own weapons and explosives.