Nixa,
The things mentioned before all apply. If you are in a pt boat and have loaded torpedoes and rockets, you must be in the #1 position to fire your torpedoes. To fire the rockets, you go to the #7 position, then hit O to open the rocket launcher, then use your trigger to fire a rocket. Use your joystick to elevate or lower the launcher for distance. I believe a salvo of one is default for these positions, but you can change that by typing in your text .salvo # and hit enter. You will see your command in the text buffer after you hit enter in orange text I believe.
Also, when you change your salvo # in planes, it will stay at that salvo # until you change it back. Not sure if it does the same in vehicles, but I imagine it does. If you need any help in the game and see me on "1ijac", feel free to holler at me and I would be happy to give you some help. I fly for the Rooks. Welcome to Aces High!
one-eye