Note: This procedure involves editing a game file;
create a backup copy of the file before proceeding. Use a text
editor to edit the "SWATGAME.ini" file in the "contentsystem"
folder in the game folder. Locate the following lines:
SPDamageModifierEasy=0.5;
SPDamageModifierNormal=1.0;
SPDamageModifierHard=1.5;

SPDamageModifierElite=1.5;
Change the value for the desired difficulty setting to "0.0".
Trainer: All weapons unlocked by Riley Trotter
Trainer: All missions unlocked by BLeH