Make the enemy soldiers act like civilians:
Find the "common/ai" folder in the game directory. Copy the guard.qvm, observer.qvm, rpg.qvm, gunner.qvm, patrol.qvm, radioguard.qvm and sniper.qvm files to a backup folder on your desktop. Make another folder on your desktop, then copy the civilian.qvm file there. Rename this file to one of the files listed above, then copy it back to the "ai" folder. Copy and rename the civilian file until each of the above files in the "ai" folder are replaced with the new .qvm file. Start the game and the enemies will behave like civilians. They will not shoot you, and will try to run away. However, tanks and cameras will still function the same way as before. If something goes wrong, copy the original files from your desktop backup directory back into the game directory.