Something is not right with mission 4 ...probably. I replayed it a few times and noticed that if you are not hurry enough to kill JTAC team, then you can not proceed. No messages and choppers did not appeared. Also sometimes the smoke option from F10 menu doesn`t work. What I mean: I sended commands to choppers to release a smoke, then smoke off, few times like that and lastly the choppers were unable to stop the smoke. Probably some DCS-sm , just reporting my osbervations
Lurz's post in I don't like, not immersive. was marked as the answer