okay i know alot of you are waiting for the email to unlock all early and many were asking should i just choose one and get going, my answer is just go for it, why? well i just reached specializations and choose pioneers so itll make it easier to rank up in future and was suprised to find that all you need to do is go up 10 ranks and the first rank you only have to get about 12,000 xp… ive just been battling to get 40,000 to get upa rank its so easy and itll take no time at all if you go on infinity slayer or SWAT, by the time you get the email you guys will have finished that specialization, hope this helps