Final answer:
The responsibility to ensure required levels of support are procured, stored, and ready for use generally falls on military logistics and supply departments, essential for the success and readiness of the armed forces.
Step-by-step explanation:
The entity ultimately responsible for making every effort to ensure approved levels of support are requisitioned, stored, and maintained ready for use is typically a government or military organization.
In the context of the U.S. armed forces, which oversees various military branches including the Army, Navy, Marine Corps, and Air Force, it is the duty of the respective logistics and supply departments within these services to maintain necessary supplies.
This responsibility is crucial, as President Woodrow Wilson emphasized during World War I, understanding that the ingredients of war such as manpower, financial resources, food, and supplies, are pivotal for a nation's success in wartime. Ensuring ready and available supplies not only supports strategic operations but also affects the morale and capability of the fighting forces.