RATPAC is a totally reconfigurable modular shoot house designed for police, soldiers, and drug-enforcement personnel. RATPAC (an acronym for Reconfigurable Armored Tactical Personnel And Collective) is an easily transportable modular building constructed with pre-fabricated units that are reconfigurable internally and externally, allowing for virtually any floor plan and multiple stories. RATPAC can be equipped with closed-circuit television, virtual and pop-up targetry, breaching walls and doors, dimmable lighting, ventilation systems, and special effects that can include everything from smoke for first responder training to meth lab smells.