Savior

During the elevator defence in Evacuation, six miners can be killed by the incoming Covenant - you need all six alive when the sequence ends, on Heroic. Hold an overwatch spot, prioritise anything rushing the platform (Grunts and Elites pushing in), and answer every Phantom drop fast. A power weapon or turret lets you thin waves before they reach the civilians. Doable on the same run as the timed Fire Drill.