The mcbutterpants_usmc.zip file you have requested: Skins / Character / McButterpants' USMC Skins - 1.49mb is not available. Perhaps try browsing all files for the game Call of Duty 4: Modern Warfare and upload any files you want to share or are missing. This is the only information we could locate:
Here's a cool original interpretation of the USMC uniforms by McButterpants. Check it out in the screenshots, and download the skins!