First, i made this custom shapes to use in photoshop just download ( unzip and copy to: Program Files\Adobe\Adobe Photoshop CS5\Presets\Custom Shapesthem just load photoshop see screenshot below, is a shape so u can use any size u want.

MW3 Custom Logo  Custom_Shape_screenshot

From that play around and u could get something like the one below.

MW3 Custom Logo  MW3_Logo

The transparrent MW3 logo and photoshop shapes can be download below.

MW3 Logo Transparent
Call of Duty MW3 Logo Shapes