Final answer:
The concept that focuses upon a military unit's wartime capabilities based on doctrine is logistics. It is essential for providing the necessary support in terms of personnel, materiel, and supply, which enables military units to remain combat-effective and achieve their strategic objectives.
Step-by-step explanation:
The question is asking which concept focuses upon a military unit's wartime capabilities based on doctrine. The correct answer is c) Logistics, which encompasses the planning and execution of the movement and maintenance of forces. In the military context, logistics involves securing the personnel, equipment, and supplies necessary to carry out operations. As seen during World War I and II, the success in war is greatly influenced by a country's ability to prepare and sustain its fighting forces. Effective logistics ensure that military units have the resources required to maintain their combat power and operational readiness. From providing sufficient manpower to maintaining an industrial base for producing weapons and equipment, logistics is critical for achieving strategic goals. The Art of War by Sun Tzu also highlights the importance of logistic strategies in its comparison of military tactics to water, emphasizing adaptability and the accomplishment of victory relative to the enemy's position and strength. This ancient text underlines that success in warfare is not only about engaging in battle but also ensuring that logistical supports are solid.