The Army Air Corps (AAC) provides direct aviation support, with the Royal Air Force providing support helicopters. The primary attack helicopter is the Westland WAH-64 Apache, a licence-built, modified version of the US AH-64 Apache which replaced the Westland Lynx AH7 in the anti-tank role. Other helicopters include the Westland Gazelle (a light surveillance aircraft), the Bell 212 (in jungle "hot and high" environments) and the AgustaWestland AW159 Wildcat, a dedicated intelligence, surveillance, target acquisition, and reconnaissance (ISTAR) helicopter. The Eurocopter AS 365N Dauphin is used for special operations aviation, and the Britten-Norman Islander is a light, fixed-wing aircraft used for airborne reconnaissance and command and control. The army operates two unmanned aerial vehicles ('UAV's) in a surveillance role: the small Lockheed Martin Desert Hawk III and the larger Thales Watchkeeper WK450.