Think I've got it figured out. I just put on Cry Mutiny, last season's weapon, and made progress in Vanguard Ops. Maybe they didn't change it to a pulse for the triumph this season? Give it a try and let me know, haven't slept so coulda hallucinated it lol
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Just confirmed this after running a strike. I also used Cry Mutiny, but I imagine any power grenade launcher would suffice. Editing the post to reflect this.