What would be a new setting?.
We had Nam in Bad Company 2, in the form of DLC, going back to it with more nam based maps and a nam based campaign wouldn't exactly count as being "never done before".
We've had other games touch upon Russia, Germany, United Kingdom, Japan, and the USA. What we haven't seen touched upon are the wars in China, Korea, Italy, Poland etc.
I would honestly want something new, or at the very least, a popular war, rather than one that wasn't popular, involved a fuck ton of Napalm and involved the US losing said war. We know how WWII went for sure, but we also very much knew how Nam went, and especially how that ended.
I was hoping for the Korean War personally since no game has ever done it, but would have preferred Vietnam over WW2.
I just wish the marketing team would have been honest with us from the start, instead of teasing a new setting and giving a WW2 game a name that breaks naming convention.