What do you call the difference between required resources and those apportioned to a combatant commander (CCDR)?

The term that refers to the difference between required resources and those apportioned to a combatant commander (CCDR) is a shortfall. In logistics and resource management, "shortfall" specifically describes the scenario where the available resources fall short of what is necessary to meet the strategic or operational needs of the CCDR. Understanding shortfalls is crucial for effective planning and resource allocation, as it highlights areas where additional support or resources are needed to achieve mission objectives.

In a military context, recognizing shortfalls allows commanders to identify gaps in capability and take appropriate actions to address them, such as reallocating resources, requesting additional support, or adjusting mission goals. This concept is integral to ensuring that operational readiness is maintained and that forces are adequately equipped to respond to various scenarios.