The allies_sg.zip file you have requested: Skins / Allies / Stargate - 1.61mb is not available. Perhaps try browsing all files for the game Return To Castle Wolfenstein and upload any files you want to share or are missing. This is the only information we could locate:
Stargate is based on the uniforms from the film/TV series. It uses the standard MP allies body with helmet and cap models by Sprog.