Classic Game Room’s CGRtrailers presents a trailer for the Liberation and Piazza Maps, from Call of Duty: Modern Warfare 3, for the Call of Duty Elite online multiplayer service. Actorcomedian Rob Riggle returns to educate everyone on these two latest maps from Modern Warfare 3 that are available on the Xbox Live for premium Elite members that are part of the Call of Duty: Modern Warfare 3 Season of Content event.