2a) Evacuate Rosen (This is a follow-up to a previous mission objective.)
I take it that you didn't allow the rebel soldiers to raise the alarm. As a result, leaving the map is going to be very simple, because you won't encounter ANY rebel soldiers near the hacienda. You will have to go back to the starting area (#1). Once you're there, don't go east. Instead, head south. There should be a road nearby (#2). Make sure that both your Ghost team member as well as Rosen are following your lead.
Once you've reached a new area, you should notice a few enemy icons to your right (#1). Thankfully, you won't have to worry about them, because they aren't looking this way and the crew of the gunship will kill most of the rebel units. Head down, however you should stay close to the rocks on your left (#2).
Once you've safely reached the extraction zone, you will have to wait for the rest of the team to get here. It'll probably take them a few seconds. Enter the gunship (#1). You will have to be very patient here (#2).
Once everyone is on board, this mission will come to an end (#1). Obviously you will also be able to take look at an excellent explosion. It's going to be the friendly gunship (#2). You weren't able to blow it up earlier. This is also the end of the second act of the singleplayer campaign. Get ready for the next mission.