Which echelon organizations are central to the conduct of Large-Scale Ground Combat?

Divisions and Corps are central to the conduct of Large-Scale Ground Combat because they serve as the primary operational echelons responsible for organizing, coordinating, and executing military operations on a larger scale. Divisions typically operate as the basic maneuver unit that combines various combat and support elements, while Corps serve as a higher command structure that enables multiple divisions to work together effectively. This structure allows for the integration of resources such as logistics, intelligence, and fire support, which are critical in large-scale engagements.

While Brigades and Battalions play important roles in combat operations, they operate at a smaller scale and lack the level of coordination and command structure provided by Divisions and Corps. Regiments and Companies also function at lower levels and are not typically organized at the scale necessary for large-scale operations. Divisions and Armies do represent a significant echelon, but Armies are generally focused on even broader strategic goals, encompassing multiple corps, making Divisions and Corps the most appropriate answer regarding immediate combat operations.