Type blood money to enable cheat mode. During gameplay, enter the following:

Effect                         Code 
All mercs maxed                adjectives  
Current merc maxed             bill  
Ammunition                     verb 
All weapons, max stats         liberty  
Two of each item (Abdul)       fill magazine  
999 action points              elbow room  
Max health                     noun 
Kill all enemies               deadman  
25 smoke grenades              smoke  
10 satchel charges             timers  
10 first aid kits              911
Average stats                  mortal  
+1 hour to game time           hour  
+5 min to mission time         mmin  
Set mine at chosen merc        set mine  
Max stats                      stats
Fire 100 random mortars        oh darn  
Enable all damage links        bang  
Enable all destroy links       explode  
Clown mode                     send in the clowns  
Disable clowns                 oh boys