Su-27 campaign mission 6 question

[Alexrey]

On mission 6 of the Su-27 campaign entitled "Escort anti-ship strike", the briefing says that I have to "escort a flight of Su-30 strike fighters to sink the Perry". I eventually completed it after meeting heavy resistance; destroying all the enemy bandits and allowing the 2 Su-30s to bomb the Perry. Once I saw that the Perry was on fire and that all bandits had been killed I flew back to base and landed. I then quit and saved on the debriefing screen, but when I exited and went to the campaign screen, it said I hadn't completed it yet!

 

I don't wanna have to go through dodging all those damn AIM-120C missiles again and find out that I didn't complete the mission again, so is there anything that I missed out that I was supposed to do? One thing to note is that 1 of the Su-30s was shot down, but between the 2 of them they still managed to destroy the Perry. Are both of the Su-30s supposed to survive?

 

Thanks guys.