woejipums

OK 2 people are trying to play coop in the campaign but after we finish the first mission it just puts us at the last waypoint to laze the targets and we can't get to the second mission. Neither the host or I have beat the campaign in single player mode yet...does this matter? Just wondering if it's required that we have beaten it in order to advance when playing coop and if so, is there a way to enable all missions? TY