What tactical echelon provides operational leadership and supervision directly under the MAJCOM level of Command?

The Numbered Air Force serves as a tactical echelon that provides operational leadership and supervision directly beneath the Major Command (MAJCOM) level of command. This structure plays a crucial role in executing operational strategies and missions laid out by the MAJCOM. The Numbered Air Force commands multiple groups, wings, and squadrons, effectively managing missions, resources, and personnel to ensure strategic objectives are met.

In the context of military organization, this tier functions as a bridge between higher strategic command and the tactical execution units. It streamlines operational oversight and helps coordinate missions across various units within the command. The other options listed do not serve the same purpose or hold the same level of command structure. The Airborne Command Post is primarily a mobile command and control unit. The Joint Operations Command involves collaboration across services but does not represent a direct echelon under a MAJCOM. The Support Operations Group, while essential for logistical and support roles, does not fulfill the operational leadership role that the Numbered Air Force does.