The Mod is an open world RPGish redo of the original campaign. That is to say, that it is the original campaign set in a much larger world for the player to explore. In fact, if the player chooses you can ignore the main campaign altogether and go off and explore the new content. However of course, it is advised that you do not go AWOL and DO complete the brotherhood missions so as to advance some plot-lines and to get better equipment and ammos.
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