Intro
None, you don't really need one becuase you start inflight, however you could add some titlecuts so the ride isn't as boring. Educate the player on the way to the landing zone...
Briefing
The text is breif, although I get some idea of what I'm supposed to do information is sparse.
No picture. Should have one.
The map marker marking the cobra down is small and hard to see maybe make it bigger so the player searches a bigger area.
Mission
Ok I love the way it starts in transport. But maybe you should advise the player of this in the briefing. Also love that you included the ammo in the chopper it gives you something to do during the chopper ride. You should also mention this in the briefing. You actually mention in the briefing that there is ammo in the chopper but the statement about 'ask permission' is silly and at the very least should be reduced to lower capitalization.
Ok Tried a couple of times. the helo took us in and stopped and didn't move, jumping out causes a painful death. I tried serveral times to no avail. I've always found it difficult finding a big enough spot to get the ai to land those choppers in. So there for we are stuck at that point.