I had and loved medal of honour allied assault, call of duty 1, 2 and 4 on PC, cod 3 all the way through to ghosts on Xbox, i sold cod ghost after just one day, i have not returned to cod since (prefering BF and op flahpoint cold war crisis and the Arma games, all of which i enjoyed anyway) but 2017, depending on the MP beta gameplay, will likely see me return to the church of cod.
- - - Updated - - -
It does not go down too well with the American market.
Vietnam ? One does wonder why. Seriously though, it would be good if they did, i remember enjoying the Vietcong games, made by a Czech company that i forget, they were very good, BFBC2 did Vietnam DLC, but dice is Swedish, i guess for the American COD developers, the audience especially in the USA is larger and they don't want to risk controversy.