If the Fireteam Leader fails to Discover a Cammo marker, can I activate the team again, choose another leader and then try another Discover+BS attack? (Misposted this in the wrong forum earlier, trying my luck over here!)
Yes, because the Discover limitation is: A trooper that fails a WIP Roll to Discover a Marker cannot attempt to Discover the same Marker until the next Player Turn.Per the fireteam rules (Discover is classified as a Support Skill in the Fireteam Rules): When declaring Support Skills, only the Team Leader performs the roll and applies the effects. The rest of the Fireteam members do not perform any Roll or apply their effects, but they give the Team Leader certain bonuses determined by the number of Fireteam members.Note the middle part: The rest of the Fireteam members do not perform any Roll or apply their effectsThat means that only the current fireteam leader rolls (and fails), so only the current fireteam leader applies the effects of failing. So everyone else can have a chance later.