[Home Guard]

I know this is going to be a dumb questing, but I am going to ask it anyway. I just finished watching the movie "A Bridge Too Far" again and noticed something I did not notice before.

In the movie the Guards tankers were wearing black berets but with the flaming grenade badge. Is that correct? If they were allowed to wear it instead of the Armor badge were there other regiments that might have also done so?

Thanks,

Terry