Cheat codes:
Full air support:
Hit BACKSPACE and then type "aerosmith" then hit ENTER

Skip to Level:
Hit BACKSPACE and then type "LevelSkip xx" where xxis level 1-20 then hit ENTER

FULL AMMO:
Hit BACKSPACE adnd then type "full tank" then hit enter

Vulcan gun:
!a better tomorrow

Mines:
!acme discs

Armageddon:
!armageddon

Sniper rifle:
!beautiful nikita

End of Phoenix, etc:
!cliche ending

Healing:
!doctor doctor

M-80:
!fourth of july

Air strike:
!geronimo!

Explosives:
!gnomish inventions

Sniper rifle:
!god of gamblers

Lose mission:
!i give up

Grenades:
!i have a rock

Flight mode:
!jumpjets

Stealth mode:
!ninja arts

No rocket launcher:
!no rocket launcher

Paratroopers:
!paper dolls

Flaming Sarge:
!phoenix!

Mine sweeper:
!pooper scooper

Aerosol spray:
!roach spray

Medical kit:
!rubber cement

Magnifying glass:
!ruby ray

Invincibility:
!santini

Disguise:
!shrink wrap

Disguise:
!smorfs

Full map:
!spidey senses tingling

Commit suicide:
!suicide kings

Overwhelmed by enemies:
!surprise party

New background sound:
!techno

Restart mission:
!veni vidi vinci

Flame thrower:
!village people

Reconnaissance flights:
!watchtower in the sky

Unknown:
!patton's speach

Unknown:
!fond memories

Turns Tan army to Zombies:
!night of the walking dead

Unknown:
!aluminum foil

Gray Disguise:
!metal sheeting

"Go Bruins" message:
!ucla

Unknown:
!moleman

Unknown:
!warp 6

Give all guns and cars:
!COOKIE JAR

Level Skip and 8 Men:
!MEN SKIP