FYI: You can now get Calculated Trajectory medal progression for the Mountaintop questline in Iron Banner (meaning you can progress the whole triumph doing IB) : r/DestinyTheGame
Two Calculated Trajectory Medals In One Life With Militia's Birthright - Destiny 2 - YouTube
Destiny 2' Mountaintop Quest, Perks: Season 5's Crucible Pinnacle Weapon