Operation: Firestorm is an enhancement mod for C&C Generals: Zero Hour. This mod currently features 8 unique playable Generals each with a huge arsenal of new units, buildings and special powers ar their disposal. While the core gamplay stays the same, a number of interesting new gameplay mechanics are added. In addition the overall visual quality is greaty improved, including new models, textures, FX and an improved User-Interface, available in full-HD resolution.
Here's the promised video of the Chemical Missile in action
It comes with a special acid mixture which is not only deadly to infantry, but also damages buildings and vehicles.
(Note: Balancing is still in progress, damage isn't final.)