The large twin-rotor Boeing Chinook is the RAF's heavy-lift support helicopter. Originally ordered in 1978, with subsequent orders in 1995, 2011, and 2018 (yet to be finalised), the Chinook is operated by No. 7 Squadron, No. 18(B) Squadron and No. 27 Squadron at RAF Odiham and No. 28 Squadron (Support Helicopter OCU) at RAF Benson. Since being first delivered in 1980, the Chinook has been involved in numerous operations: the Falklands War (1982); Operation Granby (1991); Operation Engadine (1999); Operation Barras (2000); Operation Herrick (2002–2014); Operation Telic (2003–2011); Operation Ruman (2017); and Operation Newcombe (2018–present). The 60-strong fleet of Chinooks currently has an OSD in the 2040s.