The usmc_skin.zip file you have requested: Modifications / Skins / USMC Skin - 8.52mb is not available. Perhaps try browsing all files for the game Wolfenstein: Enemy Territory and upload any files you want to share or are missing. This is the only information we could locate:
For more information on Return to Castle Wolfenstein: Enemy Territory, visit Returntocastlewolfenstein.filefront.com This file contain the new skins for Wolfenstein ET. They were taken from the skins of pacific assault game.