CarnageINC
Clansmen
Its close to open beta now, they will reset most likely anything done in closed beta and this stress test. But from what I read it will have a lot of the new features included in it.
http://armoredtalk.com/2015/09/22/open-stress-test-for-armored-warfare-on/
http://armoredtalk.com/2015/09/22/open-stress-test-for-armored-warfare-on/