Art Of War mod is partial-conversion modification adding lots of new features to old Zero Hour's gameplay, they are discussed in summary.
Basically it is redesign of old Nuke Cannon, but it was also rearmed with usual high-explosive shells instead of nuke shells. It is available for all generals (including Tank General) after building the Propaganda Center.
At the third veterancy level Tactical artillery gains:
Tactical nuke shells (in case of Artillery and Nuke General)
Seismic shells (Infantry General)
Napalm Shells (Tank General)
Reminds me of the ROTR nuke cannon...
ROTR uses the Beta Generals Nuke Cannon with 6 supportive legs. This is presumebly also the beta model.
USA also had a nuke cannon; they should have a countermeasure for this ;)
idea stolen from R.O.T.R. https://www.moddb.com/mods/rise-of-the-reds/images/chinese-nuke-cannon1#imagebox
Or just independantly thought of... :-|