This mod was a german fan-project called Tower Defense: Trinity Force for C&C Generals Zero Hour...
One of the most important support weapon is the
EMP. The EMP is available for every Defender and
differs a little in their appearance from ZH. You
can use them to disable vehicles or even to
destroy some jets (Note: you get no money and
experience doing so, because you don't really
"kill" them, but "disable"
them. Disabled jets can't fly any more).