This mod makes hundreds of changes, large and small, to the vanilla version of the game. It is harder and longer than the vanilla version but gives you many more tools to combat the alien threat.
Long War: Overhaul mod for Enemy Within with eight-soldier squads, new classes, base missions to retake countries, new perks and items, alien leaders, interceptor experience, and much, much more. You may need a 7z decompression tool.