For every finale, its just full on taking on hordes and tanks. USre, there's some directions but I thought it'll be easier to just tell you how every finale works once you get to the safe point, which isn't hard to get to.
Some tips: Reload A LOT.
Make sure you're team is ready. Teamwork is key.
Shoot then evade from the tank.
Always keep medipacks and explosives with you. they WILL help. Thanks for looking at my walkthrough. Hope you have fun! :D