I know this is an old thread, but I'm only just starting to go through career mode. I've just spent a fun 5-10 mins dodging the patrols (I've played Arma 1 & 2 so it feels right,hehe), was heading for Skipper, then I heard the cockpit warning beeps for a chopper, and the CAS Littlebird had been shot down just above me!! I assume it was an IGLA seeing as some of the OPFOR soldiers were carrying them.
I managed to get to Skipper using the hills for cover, but like other posts , expected it to 'trigger' and get some sign of incoming rescue. After a couple of minutes taking out 6 OPFOR's, I got up and started moving to see if it would trigger anything,... and got shot :(