Contra is a freeware modification for Command and Conquer Generals: Zero Hour real-time strategy game and one of the first mods for this game. It adds many new units as well as numerous new upgrades, new general's powers and buildings. It also adds new sounds, maps, bug fixes, enhanced graphics, and other effects, as well as three new generals.
Another USA structure makeover is given to Airforce general's Superweapon. Again, bad UVW map and texture design, but also lack of night version led to improvement. Few more details added, looks neat in game.