As far as I know there isn’t another alternative, that’s the black beret that the game has, and it’s awful.
A tanker helmet would be better, not because they’re more common, but because they don’t look like shit in comparison.
Same problem with the Mk III helmet, the bright green is so dumb and it needs to be changed.
That’s actually the official reason mostly used by these officers when they decided not to make the switch, of course war memoirs paint a more broader picture.
“Erm, no that’s alright Sir… I’ll just carry on with me rifle.”