Does it need to be finished with with a fireteam? If so why?
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GREAT QUESTION as running solo plus who ever else is around at the time, I still have 0% completion.
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It does need to be finished with a fireteam, though as far as I'm aware the triumph is advanced for everyone in the fireteam so not everyone has to be present at the event itself, and you only need one other person to constitute a fireteam (as opposed to the triumphs which require a fireteam of three).