Rost's history is mostly unknown. He and the rest of Grun Team were sent as reinforcements to Area B7R on April 20, 1995 when Galm Team was shooting down other Belkan pilots over the airspace. Rost and his comrades were shot down, but he survived.
The Allied Forces lost track of him following the war's conclusion. Reports claim that he is fighting as a volunteer soldier in an effort to free a small eastern country from its authoritarian government.