The united_nations_squadron_skin.zip file you have requested: Skins / Player / UN player skins - 1.85mb is not available. Perhaps try browsing all files for the game Soldier of Fortune II and upload any files you want to share or are missing. This is the only information we could locate:
A set of skins based on the UN. These replace the Promethius default skins. To install just extract the pk3 to your base folder. To uninstall simplay delete the pk3 from you base folder.