We have pushed a fix to address the issue with Rank 20 rewards. If you are missing your rewards for Class Rank 20, please play a match to completion and the Rewards should drop into your Armory.
Thanks for sticking with us.
Swap Assault and Medic guns
Do that and TA DA! Tanks will be playable again due to the lack of Assault and people will get revived again because of the surge of medics. It'll be just like BF3 and BF4 where the engineer who was anti tank used carbines and the medic(assault) used assault rifles.