So you need to complete the yellow-marked "Recapure the Port Facilites" combat deployment in order to unlock all of the final missions. The hitch is that you need an APC. I have a tank, but no APC. Where's a good place to get one? Besides Episode 9, where the vehicles are all on the move and it's difficult to Fulton them. The more stationary the better.

Thanks!

Episode 9 with EMP mines?

Yeah, emp mines are perfect for that if you have them. Otherwise a decoy can work in a pinch

Those "Eliminate the Armored Unit" side ops usually have one. Alternatively, episode 9. Park your horse in the road, and just sneak up from behind.

Are you sure about needing to do that combat deployment thing? I haven't done it, but I have access to all missions as far as I know

Well it appears simply replaying Episode 9 triggered the next cutscene, but regardless the D-Horse trick worked. Thanks for all your help!