second (Militia) lines of the Army. Partisan – In the 20th century, someone part of a resistance movement. In the 18th and 19th century, a local conventional military force using irregular tactics. Often used to refer to resistance movements against the Axis Powers during the Second World War. Freedom fighter – A type of irregular military in which the main cause, in their or their supporters' view, is freedom for themselves or others. Paramilitary – Non-regular Armed Force with a claim to official status. Terrorist – An irregular military that targets civilians and other non-combatants to gain political leverage. The term is almost always used pejoratively. Although reasonably well defined, its application is frequently controversial. False flag or pseudo-operations – Troops of one side dressing like troops of another side to eliminate or discredit the latter and its support, such as members of the Panzer Brigade 150, commanded by Waffen-SS commando Otto Skorzeny in Operation Greif during the Battle of the Bulge in World War II and Selous Scouts of the Rhodesian Bush War. Insurgent – An alternate term for a member of an irregular military that tends to refer to members of underground groups such as the Iraqi Insurgency, rather than larger rebel organizations like the Revolutionary Armed Forces of Colombia. Bandit Private army Mercenary or "soldier of fortune" – Someone who is generally not a national in a standing army or not otherwise an inherently-invested party to an armed conflict who becomes involved in an armed conflict for monetary motives or for private gain. Mercenaries are often explicitly hired to fight or provide manpower or expertise in exchange for money; material wealth or, less commonly, political power. Mercenaries are often experienced combatants or former regular soldiers who decided to sell their combat experience, skill or manpower to interested parties or to the highest bidder in an armed conflict. Famous historic examples of "professional" or organized (often "career") mercenaries include the Italian condottieri, or "contractors," leaders of "free agent" mercenary armies that provided their armies to the various Italian city-states and the Papal states during the Late Middle Ages and Renaissance Italy in exchange for profit, land or power. However, not all soldiers deemed to be "mercenaries" are "professional" or "career" mercenaries, and many mercenaries may be simply opportunists or persons with no prior combat experience. Whether a combatant is truly a "mercenary" may be a matter of controversy