Which subdivision of a major command (MAJCOM) reports directly to a MAJCOM functional manager?

The correct answer is the field operating agency. A field operating agency operates under the authority of a major command (MAJCOM) and has specific functional responsibilities. These agencies are designed to ensure that the various activities within the MAJCOM align with its strategic goals and objectives. By reporting directly to a MAJCOM functional manager, a field operating agency can provide specialized support and guidance in its area of expertise, enhancing the overall effectiveness and efficiency of the MAJCOM's operations.

The other entities listed, such as squadrons, specialized units, and sections, typically serve more localized or operational functions and do not have the same direct reporting line to a functional manager within a MAJCOM. Instead, they may report to higher command structures or directly to other subordinate levels within the military hierarchy. This distinction is important in understanding the organizational structure and reporting relationships within military commands.