This brings us to the core of your search: the DLC.
Features standard multiplayer maps like Piazza, Overwatch, and Sanctuary, alongside Spec Ops missions. Call of Duty Modern Warfare 3 -Jtag RGH DLC-
Modern Warfare 3 DLC was released in four "Content Collections": This brings us to the core of your search: the DLC
16 multiplayer maps + 6 Face-Off maps + several Survival maps. Call of Duty Modern Warfare 3 -Jtag RGH DLC-