A MilitiaMech is a combat unit based on an IndustrialMech chassis. Though not built to the same standard as a BattleMech, a well-designed MilitiaMech can be an effective combatant.

The main difference between a MilitiaMech and an armed IndustrialMech, also called a SecurityMech, is its design and purpose. A MilitiaMech is designed expressly for low intensity combat while carrying sufficient heavy weapons and effective armor for its role. In contrast, Armed IndustrialMechs are ad hoc modifications of dual-use chassis and are often designated "MODs" to indicate they have been refitted with improvised weaponry. These refits usually skimp on armor protection and fire control systems, making them a weapon of last resort.