You can only reduce the blood and gore with the game option settings
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the gore and blood
Not when it flashes on your screen when you get hit, but you can disable graphic content by going into options.
Yes there is a blue switch in the option screen to turn it off its a blue switch
When you first start the game it will ask you if you would like to filter graphic content, or go to options and change it there,
Simply go to the black ops multiplayer settings and disable the aim assist