Irregular military refers to any non-standard military. Being defined by exclusion, there is significant variance in what comes under the term. It can refer to the type of military organization, or to the type of tactics used. An irregular military organization is a military organization which is not part of the regular army organization of a party to a military conflict. Without standard military unit organization, various more general names are used; such organizations may also be called a "troop," "group," "unit," "column," "band," or "force."