There are several types of main gun that you pick up during the game and they are frankly preposterous (but cool), you even get a flamethrower! Missiles are as you'd expect, normal, homing etc. You've got tons of firepower: a main gun, missiles, and special weapons.
I actually downloaded this game because I thought that it might be a freely roaming helicopter game like Desert Strike, but it wasn't - but that's OK cos it was still good. It's basically a vertically scrolling helicopter-based shoot 'em up, but the angle is shifted so that you are half flying into the screen, and all the graphics are proper 3D. There are actually 3 Airstrike games: Airstrike3D, Airstrike II, and Airstrike II: Gulf Thunder. Airstrike II, by Divo Games is a downloadable 3D action game for PCs.