I’m having a similar issue to many in which I can’t get past the Baptism of Fire mission. The game seems to be counting enemy players as my own, so when I (or one of my soldiers) kills enough of them I fail the mission. Here is a video of it from someone else: https://youtu.be/ptFmflw2h7U?t=94
If someone has a save file that is anywhere post that level, I’d REALLY appreciate it. It doesn’t have to be the next mission. I will catch up on YouTube or something for the parts I missed. Thanks!