How do I complete it? do I have take down the I.R.S Targ first?

I left the klingons & destroyed doomsday.

I ignored the Klingons and destroyed the Doomsday Device, the mission ended fine. You could have run into one of those "mission not completing" bugs.

Just remember forgot to destroy escort at start would that make a difference?

It might help to see if you can collect the rewards fro the mission before you warp out of the final map.

Umm, never mind. After heading back to space dock I re entered The system I needed and I am there. I have no idea how to delete this post or I would

I had started this mission, received my klingon ship and orders, then had to log due to sleep. Now I log back in and I am in my ship again and only get the Gorn ships at the Donia System. Help please?

What has helped me is warping out and then right back into the same sector. Most times it goes ahead and the ending text pops up. Not all the time, though. Just one more thing that needs to be worked on.