In my experience, any escort mission counts as "failable", regardless of whether or not it's actually possible to fail the mission. Just put "Error - how did you fail this?" in the failure text field and you should be golden.
I think they're failable because it's possible for the enemies to kill them. Doesn't happen very often, though.
Dec out.
I'm trying to add an Escort as a required mission objective, and MA says that I now have a failable objective. Even setting the Escort to Non-Combat doesn't change this. It appears that the only way my Escort can't cause a mission fail is if I make it not required (which defeats the purpose of the mission).
What am I missing??
2 50's and a bunch of random dorks...