Hi Laggy. I haven't had time to test this very far at all (I haven't even completed first objective). But here's a little feedback.
I moved the mission to the Single Player Missions directory, and started the mission.
1) The intro does not work. It is daylight, and you are in 3rd Person view of a soldier who looks down a line of tents, then looks to the right over a vehicle, then looks back down the line of tents, then looks right, ...it just keeps looping like this forever. So I hit Escape to skip this scene.
2) I like the briefing. Well done.
3) The first cutscene is great. The mushroom/fireball effect is impressive. And the apocalyptic music really fits it.
4) I drove the terrorist hideout, and encountered the civilians that you can interact with. I really prefer live interaction like this over cutscenes, as it doesn't break immersion. However, it does get repetitive when the civs all say the same thing over and over. To avoid this, you could add a few more voice files that have the same meaning, but use different voices and words. And/or, you could end remove the civ talking actions after the the first few times (and maybe have the civs runaway after giving the information).
It was late, so I did not succeed in killing all the terrorists at the first objective.
This looks very promising, and will be great fun coop. I hope to report further progress in a few days when I have more time.