British Paratrooper, M76 helmet with DPM (Disruptive Pattern Material) cover. 
 
This model, known as the M76, after the year is supposedly entered service, is the helmet synonomous with the soldiers who served and fought in the British Parachute Regiment during the Falklands War 1982.
This helmet was made by Thetford Moulded Products, Norfolk. UK. 
It has the second version three point harness chinstrap.