Which of the following represents the correct order of military branches from oldest to youngest?

The correct order of military branches from oldest to youngest is determined by their official establishment dates. The Army is the oldest branch, having been established on June 14, 1775. The Navy followed, established on October 13, 1775. The Marine Corps was then formed on November 10, 1775. Lastly, the Air Force became a separate branch on September 18, 1947, after being part of the Army.

This historical timeline clearly indicates that the Army is the oldest, followed by the Navy, then the Marine Corps, and finally the Air Force. Thus, the correct order is Army, Navy, Marine Corps, and then Air Force. Recognizing these establishments helps in understanding the lineage and historical context of each branch in the U.S. military.