Berenthor
King
In the unit's forum someone uploaded a zip in this post:
http://forums.civfanatics.com/showpost.php?p=8596929&postcount=12
It has a Huey model that fires rockets instead of a central machine gun. This would be a cool animation change to make to all the modern gunships to help differentiate them from the earlier air cavs.
Personnally I would actually make the air cav have the huey model since they are more used for troop support. The gunship can than have the apache, cobra, ka-50, eurocopter, etc. models.