Just passed mission 3 today. I dont know about real world but my procedure was to climb to 12000 ft get mark points of artillery, looking first for any air defences ,then get close until agressors lock on me but managing to target, lock and fire a Maverick to the first artillery of the column (this makes the rest stop in that point hopefully) and then turn back as fast as possible, evading a few Sams (which are now in range but can easily be evaded because its their borderline range). Then just circle around FEBA east (safe territory) until F15 Caps get rid of those agressors that were chasing. Finally with no enemy agressors around finish of the rest of artillery with CBU's 105, then try second objectives , firing The remaining 3 mavs and cbu. Finally RTB.