 Complete the following phrase:  The large twin-rotor Boeing Chinook is the RAFs 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. 18B 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 20022014; Operation Telic 20032011; Operation Ruman 2017; and 