Excerpts from the "Definition" section of US FM 100-20,
Military Operations in Low Intensity Conflict:
Low intensity conflict is a political-military confrontation between contending states or groups below conventional war and above the routine, peaceful competition among states. It frequently involves protracted struggles of competing principles and ideologies. Low intensity conflict ranges from subversion to the use of armed force. It is waged by a combination of means, employing political, economic, informational, and military instruments. Low intensity conflicts are often localized, generally in the Third World, but contain regional and global security implications.
Nuclear parity, the dynamics of modern revolutionary warfare, and economic interdependence have significantly reshaped the international arena over the last four decades. In this environment, LIC poses complex challenges to US global interests. Unfavorable outcomes of LIC may gradually isolate the United States, its allies, and its global trading partners from each other and from the world community. Unfavorable outcomes of LIC may also cause:
- The loss of US access to strategic energy reserves and other natural resources.
- The loss of US military basing, transit, and access rights.
- The movement of US friends and allies to positions of accommodation with hostile groups.
- The gain of long-term advantages for US adversaries.
US policy recognizes that indirect, rather than direct, applications of US military power are the most appropriate and cost-effective ways to achieve national goals in a LIC environment. The principal US military instrument in LIC is security assistance in the form of training, equipment, services and combat support. When LIC threatens friends and allies, the aim of security assistance is to ensure that their military institutions can provide security for their citizens and government.

