User blog comment:Crazy sam10/Call of Duty: Ghosts Teaser Trailer released/@comment-64.58.204.206-20130505101246/@comment-24548352-20130505224340

You may be right  with the Devestated US. Maybe an apocalyptic(but not nuclear), and the remains are locked in war with radicals or Terrorists.

Ghost form the Modern Warfare arc hopefully isnt the main part of the story