First Lieutenant Melissa McKay

Summary
An ODST who made the jump from the Pillar of Autumn to the surface of Installation 04. She was second in command to Major Silva, and helped secure the Pillar of Autumn's crash site. She was instrumental in retrieving supplies for the UNSC survivors from what was left of the ship.

McKay disobeyed Major Silva's direct orders and overloaded the Truth and Reconciliation's fusion generators to keep the Flood from escaping the Halo. Her actions not only cost her, and a few hundred marines their lives, but it stopped the Flood from killing thousands, if not millions, of innocent people throughout the galaxy.