Which of the following is one of the four measured resource areas in the USR?

The correct choice, Training, is one of the four measured resource areas in the USR (Unit Status Report). The USR provides key metrics that help in assessing a unit's readiness and capability to conduct its assigned missions. Training is crucial because it encompasses the skills and competencies that soldiers and units must develop to perform effectively in their roles. Evaluating the training aspect helps leaders make informed decisions regarding personnel development, resource allocation, and preparation for future operations.

The other resource areas, while relevant, do not encompass the specific focus that "Training" represents in the context of the USR. Budget, Facilities, and Resources are important components of unit operations and readiness, but they do not capture the essential element of personnel preparedness that training represents. Thus, the emphasis on Training in the USR underscores its fundamental role in ensuring that a unit is mission-ready.