Private Marie Postly was a Marine and ODST serving aboard the UNSC Pillar of Autumn and part of Major Antonio Silva's unit. Postly was killed during the evacuation of the ship when her Human Entry Vehicle parachute malfunctioned, screaming into a com channel to Silva, finally crashing into the surface of Installation 04. She faced a death all ODST Marines feared, but never talked about. It is presumed that Postly served with Major Silva in many other engagements against the Covenant.
- Halo: The Flood (First appearance)