Which missions in which campaign can be played coop?

[Gunfreak]

I just came to Mission 5 in the Yalu Campaign, and it says at the bottom of the breefing this can be played in COOP, I can't say I've noticed that in the previous missions.

Is there a list of which missions in which campagin has a coop version? Does the 109k campaign have any coop missions?

[QuiGon]

Check the campaign folder (/mods/YaluHunters). The missions that can be played in coop have '_COOP' at the end of their file names.