User blog comment:Argorrath/Black Ops III - Reveal Trailer released/@comment-1055346-20150426194914/@comment-26346930-20150426200411

Vietnam was explored in like 5 missions in Blops1.

as for WW2, not only have we not seen one since 2009 (and now graphics have improved greatly) there are also many places we havent visited (Winter war, Pre D-Day French resistance, china, and burma being a few)