update:
now for any music haters there's a music off option in the instructions section. also, the music won't cut off anymore in the middle of the level...

Now it really is complete. I've made it so you go to bank before item screen, changed the interest rate, made the aiming as good as possible (something is wrong), and added music/sound fx.

Took about a month to finish this puppy. I accidentally submitted an earlier version the previous time, which had no sound fx.

Hints:
1.Be sure to put lots of money into the bank to save up for the more useful items.
2.Aim at the gas tank to destroy trucks. If you hit them elsewhere without either an armor piercing or exploding round, they won't be damaged. Exploding rounds are an instant kill when the gas tank is hit.
3.Watch what happens when you drop an airstrike on the gas filled Rio Grande.

Finally, thanks to www.flashkit.com for sound fx.