sPvP Locker gear missing in PvE? Bummer
The helm you want is actually the Stalwart one (it’s the name that’s wrong, not the model). The Commando helm actually is in PvE and looks pretty different (it’s just a fairly long bandana mask thing – it matches the Commando set much better).
I was incredibly disappointed to find that you couldn’t get the Stalwart helm too. The rest of the set (aside, I think, from the shoulders) can be obtained during the story, so I assumed the helm could be too and was heartbroken when I had finished and still hadn’t gotten it.
Edit: I put a post about it in the bug forum, but it got buried pretty much immediately. I don’t have a lot of hope that this’ll be fixed anytime soon unfortunately.