Successfully complete the game on easy mode.

In order for the cheats to work, Edit the shortcut to the game so it reads the following:
"C:LOCATION OF GAME\mohaa.exe" +set ui_console 1 +set cheats 1 +set thereisnomonkey 1

When in the game press ~ to display the console window. Put in one of the following cheats.

Invincibility - WINCHESTER
Gives player all weapons - wuss
God Mode - dog
Heal player - fullheald
notarget - Removes target
give ammo - Max Ammo
noclip - No clipping
listinventory - List of the player's inventory
tele x y z - Teleport to location
coord - Prints out current location and angles
health - set current health
kill - Kills the player
giveweapon weapons/"weapon_name".tik - Gives the player the specified weapon

Weapon names:

Colt 45 - colt45
Frag Grenade - m2frag_grenade
Walther P38 - p38
Steilhandgranate - steilhandgranate
M1 Garand - m1_garand
Mauser KAR 98K - kar98
Shotgun - shotgun
Bazooka - bazooka
Panzerschreck - panzerschreck
BAR - bar
StG 44 - mp44
Thompson - thompsonsmg
MP40 - mp40
Springfield '03 Sniper - springfield
KAR98 Sniper - kar98sniper Info submitted by XAnimal on Tuesday, January 15, 2002 at 09:02:42 Map Lists

Type maplist to bring up a list of levels.
map <mapname below>
- go to map
m1l1 m1l2a m1l2b m1l3a m1l3b m1l3c m2l1 m2l2a m2l2b m2l2c m2l3 m3l1a m3l1b m6l3e

Description: Cheat code
------------------------
God mode: dog
Full Health: fullheal
All Weapons and Ammunition: wuss
No Clipping: noclip
Set Health: health <number>
Suicide: kill
Level select: map <mapname>

To enable the cheats, modify the link/shortcut that will start the game with this target:

drive:\folder path\mohaa.exe +set ui_console 1 +set cheats 1 +set thereisnomonkey 1

for example:
c:\program files\ea games\mohaa\mohaa.exe +set ui_console 1 +set cheats 1 +set thereisnomonkey 1

Dog=God mode
Wuss=guns and ammo
Fullheal=
Notarget=
Sorry but I don't know how to enter the data.
Guess use an enter key or just try your luck.