||In Fallback, as Corporal Shepard, you are part of a platoon of marines supplying additional security at Monte del Oscuro (an astronomical research facility). After things go wrong, you need to escape.
In Fire, it's a flashback level to a Balkan town. Objective is to rescue a UN representative from a Warlord. Then you flash forward to the Antarctic.
In Ice, you are then assigned to a hardship post in the Antarctic guarding yet another research base in the middle of nowhere. It was a quiet posting until a mysterious alien artifact was found while drilling ice cores. The secret is out, and foreign powers desire the artifact. Your orders are to defend the base and the scientists at all costs.