User blog comment:Damac1214/Sledgehammer Games Says They Would Jump at the Chance to Finish Action Adventure Call of Duty if Activision Gave the Go Ahead/@comment-24001421-20140515123341

''“It’s kind of unpopular. And we didn’t really understand the marketing aspect of that.”''

is that why we havent seen one before? still though, i think its incorrect that there hasnt been a game named vietnam...