Foster was an officer who traveled with Sanchez, Michael Garibaldi, and Jeffrey Sinclair over the surface of Mars.[1]
Following orders, Sinclair refuses to tell Garibaldi what they were looking for, and even filed fake flight plans so nobody else would know where they were. On the fifth day of searching, the ship's navigational systems and inertial dampers suddenly went offline. Garibaldi managed to crashland the ship: Sanchez's leg was broken and Foster did not survive.