ADP 3-90, page 92

Glossary Glossary-6 ADP 3-90 31 July 2019 economy of force The judicious employment and distribution of forces so as to expend the minimum essential combat power on secondary efforts to allocate the maximum possible combat power on primary efforts. (JP 3-0) *encirclement operations Operations where one force loses its freedom of maneuver because an opposing force is able to isolate it by controlling all ground lines of communications and reinforcement. engagement A tactical conflict, usually between opposing lower echelon maneuver forces. (JP 3-0) *engagement area An area where the commander intends to contain and destroy an enemy force with the massed effects of all available weapons and supporting systems. *exploitation (Army) A type of offensive operation that usually follows a successful attack and is designed to disorganize the enemy in depth. *field army An echelon of command that employs multiple corps, divisions, multi-functional brigades, and functional brigades to achieve objectives on land. *final coordination line A phase line close to the enemy position used to coordinate the lifting or shifting of supporting fires with the final deployment of maneuver elements. final protective fire An immediately available, prearranged barrier of fire designed to impede enemy movement across defensive lines or areas. (JP 3-09.3) fire support coordination measure A measure employed by commanders to facilitate the rapid engagement of targets and simultaneously provide safeguards for friendly forces. (JP 3-0). fires warfighting function The related tasks and systems that create and converge effects in all domains against the adversary or enemy to enable operations across the range of military operations. (ADP 3-0) *fire team A small military unit typically containing four or fewer Soldiers. *fixing force A force designated to supplement the striking force by preventing the enemy from moving from a specific area for a specific time. *flank The right or left limit of a unit. *flanking position A geographical location on the flank of a force from which effective fires can be placed on that flank. *forms of maneuver Distinct tactical combinations of fire and movement with a unique set of doctrinal characteristics that differ primarily in the relationship between the maneuvering force and the enemy. forward edge of the battle area The foremost limits of a series of areas in which ground combat units are deployed to coordinate fire support, the positioning of forces, or the maneuver of units, excluding areas in which covering or screening forces are operating. (JP 3-09.3)