i was going to have a bash at editing the mission but i then realized that the events aren't in order so i didn't want to tamper with them incase i crash the mission.
I'm going to quote what I found out, posted in the Derelict thread.
There seems to be some issue with the SEXPs going off for the return to base message.
Criteria is is Zodiac leaves/destroyed(bomber wing) AND Cancer(fighter wing) leaves/destroyed and Vigilent has departed. When that happens, there's a send message to return to base. However that dosn't link into anything.
EDIT once again: That SEXP however dosn't DO anything.
There are two other events, identical ones, that go 'when key pressed(alt-j) happens, do nothing'.
I'm not a FREDer, so I'm not sure how to fix.
Now for debriefing information:
A sucessful mission is when the Return to Base Criteria is (not?) 0, but in the event window, I see nothing related to that.
I'll skip the Vigilent dead status.
AWOL is when both Return to base is 0 and Mission failure is(not?) 0.