What does FMC designate regarding an aircraft's operational state?

The designation of FMC as "Full Mission Capability" signifies that an aircraft is fully operational and ready to perform all of its assigned missions without any limitations. It indicates that the aircraft has passed all necessary checks and maintenance procedures, ensuring that it is equipped with all required systems and capabilities to engage in its intended operational tasks.

Full Mission Capability is crucial in military aviation as it directly impacts readiness and the ability to effectively carry out assigned missions. When an aircraft achieves this state, it assures personnel that all systems are functioning correctly, and the aircraft can respond to operational demands without restrictions.

In contrast, the other choices represent different interpretations of FMC that do not capture the full context of mission readiness and operational functionality that the term typically conveys within military aviation.