ok first little bug - when i died, i actually got the debriefing with winning text
Edit it was actually both winning and loosing text, you should work with debriefing sexps
I would suggest connecting them with mission goals. Also destroyed or departed delay should be used in spetial situations only, you should either use is-destroyed-delay or has departed delay.
problem 2: as all your mission objectives have "true" as therirs Sexp's, they are already done. this means, among other things, that you have absolutely no idea when the mission is over
Last. I hope you don't take this critics personnally. I just wanted to point out few things