Which of the following describes an MRU?

An MRU, or Military Reporting Unit, is defined as a fixed ground unit that operates under military jurisdiction. This designation emphasizes its role within the military framework, where the MRU is focused on reporting and operational duties that are crucial to military command and control. The relationship to military jurisdiction means that the MRU is subject to military regulations, oversight, and objectives, functioning within the structured environment necessary for effective military operations.

In contrast, the other options do not align with what constitutes an MRU. A commissioned air traffic control facility pertains to civilian or non-combat roles, while a civilian air traffic control center is explicitly outside military authority and functionality. A flying operational unit typically refers to units involved in air operations, which is different from the ground-based reporting focus of an MRU.