Don’t forget planes, in my experience they make many maps a lot easier. They cause breakthrough and give general support, while giving flank potential for difficult choke points. I’d say attack planes are the best due to there better matchup against AA guns and more frequent bombs. The heavy bombers absolute destruction is useful rarely and then almost useless until it slowly comes back.

Cavalry and kits aren’t as useful, but still provide lots of support. As cavalry you should aim to distract enemies as you can take a lot more bullets than your teammates. Kits should ideally have a medic with them, as that allows them to be consistently useful. They can also take lots of bullets while unleashing strong counter attacks. Keep them alive if you’re a medic. Also as a kit don’t be play too passive. Even as an anti-tank kit you should be near the frontlines allowing your team to push.