Which term refers to the overall ability of a unit to sustain operations required by a mission?

The correct term that refers to the overall ability of a unit to sustain operations required by a mission is capability. Capability encompasses the full spectrum of elements that allow a unit to perform its assigned tasks effectively, including the personnel, equipment, training, and resources necessary to execute mission requirements.

In a military context, capability implies a readiness to respond to various operational scenarios, ensuring that a unit can maintain operational effectiveness over time and adapt to changing circumstances as required by its mission objectives. This term is commonly used when discussing military effectiveness, as it inherently includes sustainability, readiness, and the ability to execute planned operations.

Other potential terms, such as cohesion, capacity, and complexity, have distinct meanings. Cohesion refers to the bonds and unity among unit members, which can enhance performance but isn't a measure of operational sustainability. Capacity relates more to the quantity of resources available without necessarily reflecting the effective use or strategic application of those resources. Complexity pertains to the intricacy of operations or environment but does not directly indicate the unit's ability to execute a mission sustainably.