Talon and Angels, you guys are having the exact same problems i was having at first.
I did two things to fix it, not sure which one actually fixed the problem.... but here they are.
One is i re-installed AH, this was to fix my film viewer and attempt this mission.
THe other is, make sure you have a MISSRES folder. In Ranger's missions he has special affects that need to go into this folder, I didnt have this folder because it didnt come with my Big Aces High folder. I had to create one, and once i made one and put the .wav folder into it, the mission worked fine.
If you already have a MISSRES folder and already put the .wavs into it, them im sorry i cannot help.
That was teh problem for me and thats how i fexed it, hope that helped you.