Krav Maga is a self-defense and military combat system. The version of Krav Maga taught in civilian martial arts classes is more often a simplified version that emphasizes personal self-defense, and is likely to exclude the killing techniques taught to the military, or the holds and come-alongs taught to police forces; there are generally legal proscriptions in some countries which govern and constrain the teaching of hazardous or life-threatening techniques to 'civilians'.