This COD is set in the Cold War I think.
It looks like it's set in Vietnam, there wasn't actually alot of armed conflict during the cold war...
This.
Should be at least 48 hours to finish or so, with alot more hours in special ops.
Are you stupid? First person shooters shouldn't be more than 10 hours.
If you want a really long game you're in the wrong place, go play ME2 or Oblivion or something.