Unlock Specializations?

So this may sound a like a rookie question; but I was reading about the new updates and the 28th update(If I’m not mistaken) said: Engineer and Stalker Specializations unlocked for all players.

Does this just mean I can view them now? They’re not unlocked. Did I have to play the game during the launch or before November 20th?

Any information would be appreciated.

You have to be at least an SR-50 to enlist in a specialization.

What is your current Spartan Rank?

Oh I see then. Well I’m Level 47 so it shouldn’t be long now. Thanks for telling me.