Omega Neo,
Nam is an excellent game. Here are a few techniques I use that you may find helpful:
1-Rapid Fire- Instead of holding the fire button down, tap it as quickly as possible. Using this method can make your normal gun almost as powerful as the Vulcan. Only hold the button down when you want to move your cross-hairs without moving your character. P.S.- Don't tap the button when you have the Vulcan or the Flamethrower, it uses up ammo faster.
2-Rolling- This is absolutely, hands down, without a doubt, the most importand skill to master! Learn when & where to roll, and the game is yours. Remeber that you can come out of a roll and instantly go into another one. This is crucial in the later levels when the screen is covered with enemy fire.
3-Know your weapons- Standard gun- I think it's an M60, better learn to use it, or you're gone. Standard grenade- Despite what you might think, the standard gun works better agains large mechanical bosses. Grenades work best for taking out helicopters in one shot, or clearing a cluster of troops. Flamethrower- Very effective as an anti personell weapon, and gratifying to use, however, it cannot reach high-flying enemies. Vulcan- M16 with grenade launcher. Excellent all around weapon with a generous ammo supply. Missile launcher- Only one of these in the game that I know of. Powerful, but limited ammo. Super grenade- The most powerful weapon in the game. Better to have one of these as an ace-in-the-hole than to have any other weapon. When combined with Double sights; look the F@*& out! Double sights- Doubles firepower. Very important to try & keep these. Works exceptionally well with Flamethrowers and Super grenades. Extra Life- Obviously, very important. I can only think of one though. It's in that VTAL aircraft on the last level.
4-Use those Women!- Having a Foxy Mama helps a lot. They can't be killed, so just worry about keeping your guy alive. The best piece of advice I can offer you is this: When you roll, continue to tap the fire button. The women will keep shooting while you roll! It is VERY usefull!
Not to toot my own horn, but I will, because this site is the only place where this means a damn, but; using these techniques, I can beat the game without dying. That's right, I'm a loser that has no life outside of his Neo.
Good luck & let me know how you make out!
P.S.- Fran- I agree, this game is unsurpassed in mood & atmosphere. It's one of my favorites also.