Batallones de Lucha Irregulare. There are thirteen Irregular Warfare Battalions (Batallones de Lucha Irregulares--BLI) created to fight against the Contra rebels. The BLIs are lightly armed, highly mobile, quick-reaction forces trained in counterguerrilla tactics. Soviet-supplied helicopters are used to quickly insert the BLIs into trouble zones, and to carry out operations in depth against the Contras.