They do nothing besides earn achievements.
An Achievement
There are actually some youtube vids on that. I watched one of em and it was a big help. [=
Modern warfare 3 is better
The intervention is not in modern warfare 3. Modern warfare 2 has the intervention.
Modern Warfare 3 is not in 3D.
Modern Warfare Mobilized(the DS port of Modern Warfare 1) & Modern Warfare 3.
The Intel core i7 processor processes data at at least 3 gigahertz. Laptops with this processor are such as the Asus K52JT-XT1 and the HP Envy 15-1050nr.
Modern Warfare 3.
Call of Duty 4: Modern Warfare came out first. This is the first game in the Modern Warfare series, and Modern Warfare 3 is the third game in the Modern Warfare series.
There is no demo for Call of Duty: Modern Warfare 3.
There are no demos for Call of Duty: Modern Warfare 3.
Modern Warfare 3 IS World War 3.