If you're using an
emulator, load the game, enter the codes but don't turn
them on yet. Reset the game, then as soon as you see
the title screen, then turn the codes on. This method
should work on most emulators.
The following codes only work for the LHX chopper, not
the Apache chopper.
ACWT-EADL
The LHX chopper has infinite ammo for the 20mm
chain gun!
ACWT-EAD0
The LHX chopper has infinite Hellfire missiles!
ACWT-EAEW
The LHX chopper has infinite Sidewinder missiles!