Here's a demo mission
of how you might make your scenario.
Player starts in the barracks tent and gets a quick briefing from an officer. There's a Blackhawk coming in for a landing and the rest of his squad is outside the tent. The Blackhawk will land and wait for the group to board. This can sometimes be tricky, so you board first then tell your AI to get in. Then it's off to find the SUV!
The pilot will spot the SUV and land near it. It's empty. Once in the SUV set off to Shahbaz to clear it of the 5 bad guys there. Once the town is clear head to the LZ east of town and use your radio to call for extraction. This will call the LittleBird you saw at base to come get you.
Once back you'll notice the Blackhawk has landed now as well as the Apache that was coming into the airfield for rearming as you left. No sign of the A-10 though. :)
Let me know if you have any questions about how any of this worked.