This is for bombing purposes
Do I use tactical or attack bombers for arty?

I have and when I search arty, I cannot find this specific answer. As typing arty adds all mentions of it. I may be old and not good at knowing how to research exactly.
I did find WIKI. It is considered "unarmored" not infantry. I think my terminology was wrong.
It should be:
unarmored
light armor
heavy armor

not:
infantry
light armor
heavy armor
artillery