I was confused about this too... according to wikipedia there were only the 2 seasons, but you can watch the Whittmann and a couple Vietnam episodes on TVO, that aren't part of those seasons..
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Tiger I - Panzer II - Panzer III - Panzer IV - Chi Nu Kai - Panther G - KV-1b 756(r)
M4A3(76) Sherman - T-34/85 - M3 Grant - SECRET PROJECT