Cheat mode:
Press ~ during game play to display the console window, then type 
giftfrompterodon to enable cheat mode. Then, enter one of the following codes.
Note: Most of the codes can only be used in single player mode.

Effect - Code 
Restore health - chtheal  
Restore health for team - chthealteam  
Weapon select - chtweap <0-30>  
Refill ammunition - chtammo  
Get grenades - chtgrenades  
Enemies cannot hurt you - chtkostej  
Access all quick fight maps - chtallqf  
VC and NVA wear Indian masks - chtcannibals  
Toggle third person view - cht3pv <0 or 1>  
Toggle frame rate display - showfps <0 or 1>  
Toggle stat display - showprof <0 or 1>  

Weapons:
Enter chtweap <number>

Number - Weapon 
1 M16  
2 Ak47  
3 Scorpion  
4 M1 Garand Sniper Rifle  
5 DP2 Machine Gun  
6 PPs 41 (Drum Clip)  
7 Colt .45 Pistol  
8 Tarakov  
9 Marakov  
10 .38 Revolver  
11 Remmington Shotgun  
12 Winchester Rifle  
13 Tokarev SVT40  
14 SVD Dragunov  
15 SKS Simonuv  
16 SVT40 Sniper  
17 M60 Heavy Machine Gun  
18 Degterav Machine Gun  
19 US-M3  
20 (none)  
21 Thompson  
22 Silenced Colt .45  
23 PPs 43  
24 M14  
25 M1 Carbine  
26 Mosin Nagant  
27 M79 Grenade Launcher  
28 Bakiael Shotgun  
29 US Knife  
30 VC Knife  
31 M14 Sniper  
32 Sten