Well, the title says it.
I started the Fleet Delivery Mission. While on my way, the station was destroyed (probably by the nearby Ventari) and i had no way to complete it.
When returning to the CSC, i was told to get back to my mission and worst of all: they would not give me my stuff back!

xephyr 3 Mar 2016:

I think fleet missions have a timeout if you gate out or spend too much time in the system, in which case you get your cargo back and the mission is treated as a failure.

nms 3 Mar 2016:

I'm not sure about that, but the mission will fail if you die. (I think this includes if you have insurance.)

Also, you'll magically get your stuff back if the CSC dies. (Obviously, the Fleet won't be happy if you're the one who kills it.)

Another oversight with this mission is that it doesn't leave the player with any fuel. It should probably remove ammo that isn't compatible with an installed weapon, but not fuel that's compatible with the installed reactor.