Corporal Mahler is a member of Viper Squad. He led a team with Tech Li and Medic Hayes, which held a position leading to the Strogg hangar. After meeting Sergeant Morris, Mahler leads an assault on the hangar with Matthew Kane. After securing it, Mahler leaves the hangar when Corporal Rhodes arrives.
- Mahler has an odd understanding of rank. He seems to be happy giving orders to Kane (a corporal) and confident suggestions to Morris (a sergeant), yet refers to Rhodes (a corporal) as 'sir'.