No. 11 or XI Squadron (sometimes featuring an 'F' to represent its historic fighter role (No. 11(F) or XI(F) Squadron)), is "the world's oldest, dedicated fighter unit" and continues the traditions established by the similarly numbered Royal Flying Corps squadron, established in 1915. After a history of equipment with numerous different aircraft types, the squadron most recently operated the Tornado F3 until 2005 when it was disbanded. It was reactivated in 2006 to operate the Typhoon F2, receiving its first aircraft (serial number ZJ931) on 9 October 2006.