The U.S. military for years has debated the utility of counterinsurgency operations. Drawing from a sentiment that harkens back to the Vietnam War, many within the military have long opposed counterinsurgency operations. Others see counterinsurgency as the unavoidable future of U.S. warfare. The debate is between those who believe the purpose of a conventional military force is to defeat another conventional military force and those who believe conventional military conflicts increasingly will be replaced by conflicts more akin to recent counterinsurgency operations. In such conflicts, the purpose of a counterinsurgency is to transform an occupied society in order to undermine the insurgents.
Understanding this debate requires the understanding that counterinsurgency is not a type of warfare; it is one strategy by which a disproportionately powerful conventional force approaches asymmetric warfare. As its name implies, it is a response to an insurgency, a type of asymmetric conflict undertaken by small units with close links to the occupied population to defeat a larger conventional force. Insurgents typically are highly motivated -- otherwise they collapse easily -- and usually possess superior intelligence to a foreign occupational force. Small units operating with superior intelligence are able to evade more powerful conventional forces and can strike such forces at their own discretion. Insurgents are not expected to defeat the occupying force through direct military force. Rather, the assumption is that the occupying force has less interest in the outcome of the war than the insurgents and that over time, the inability to defeat the insurgency will compel the occupying force to withdraw.
According to counterinsurgency theory, the strength of an insurgency lies in the relationship between insurgents and the general population. The relationship provides a logistical base and an intelligence apparatus. It also provides sanctuary by allowing the insurgents to blend into the population and disappear under pressure. Counterinsurgency argues that severing this relationship is essential. The means for this consist of offering the population economic incentives, making deals with the traditional leadership and protecting the population from the insurgents, who might conduct retributive attacks for collaborating with the occupying force.