The Firebat was a unit which used a flamethrower weapon and was often employed against units like the Zergling.
Like standard Marine Infantry, Firebats are typically “culturally challenged persons” who have been Resocialized by the Confederate government. Equipped with powerful, arm-mounted flame throwers, they serve as assault troopers in the various Terran Militias. Although their attack has a limited range, the flame throwers cause considerable damage to any target caught within the stream of fire. Firebat Combat Suits provide additional protection from heat and flame, although they are significantly heavier than standard Marine armor.
The Firebat was a unit in the first StarCraft and in the early development of the sequel. It was replaced by the Marauder.