Does anyone have any information on the helmets being worn by these SAS members in the photos below? Apparently these helmets were also used by the anti terrorist members of Canada's JTF2 in the early 90's. The shell resembles an armoured crew helmet but the liner is very different so it would seem that they were made specifically for special operations forces. The helmets in these photos are missing the communications headphones. Any information available?
![SAS / special operations forces helmets Tag111](https://i.servimg.com/u/f62/18/09/71/69/tag111.jpg)
![SAS / special operations forces helmets Britis12](https://i.servimg.com/u/f62/18/09/71/69/britis12.jpg)
![SAS / special operations forces helmets Sasrec12](https://i.servimg.com/u/f62/18/09/71/69/sasrec12.jpg)
![SAS / special operations forces helmets Tag111](https://i.servimg.com/u/f62/18/09/71/69/tag111.jpg)
![SAS / special operations forces helmets Britis12](https://i.servimg.com/u/f62/18/09/71/69/britis12.jpg)
![SAS / special operations forces helmets Sasrec12](https://i.servimg.com/u/f62/18/09/71/69/sasrec12.jpg)