The hidden harriers are:

Mission 2 - In the airfield, destroy all buildings and the one, if you look at it as is was on your SMFD, it's the upper right buliding. it's in here.

Mission 3b - Go to the new LZ (not homebase, look on the SMFD) and go due west. when you come to an undestroyed building that looks like the White House, destroy it. It's in there

If you just can't seem to stay alive in Nuclear Strike, enter the password LAZARUS to keep flying.

Enter the password GOPOSTAL to get infinite weapon reloads.

To remove the enemies from the first mission, enter the password AVENGER.

To reduce your fuel consumption, enter the password MPG.

Enter the password WARPDRIVE to speed up your vehicles.

For four lives, enter the password PHOENIX. For five lives, enter the password WARRIOR.

For infinite armor, fuel and attempts, enter the password PACKISBACK.

When entering a password at the password screen, enter "COMMERCIAL" as the password and you'll get the Full Motion Video preview of Future Strike, the next Strike Series game.

In the first level you have to pick up a box. Around the box are all kinds of huts and bushes. Destroy all of these first to evade the ambush.

Enter the password LIGHTNING to enter a secret level. If you beat it you'll see a preview of the next Strike game.

For a change of pace, enter the password EAGLEEYE. You'll be taken to a peaceful version of the first mission.

Strike out with this complete set of passwords.

Level  Password
2      CUTTHROATS
3      COUNTDOWN
3b     PLUTONIUM
4      MACARTHUR
5      ARMAGEDDON

Enter the password "Andrea" to hear one of her special news reports.