Brand New! UNITED STATES ARMY - Rank CORPORAL E-4 Challenge Coin with Case You will receive one Challenge Coin. Photo depicts front and rear of coin.Fast shipping from USA...High Quality items. 40mm with protective case.USPS First Class Shipping with Tracking.Ships within 24-48 hours from ordering.Perfect gift! The rank of corporal was established in 1775 with the birth of the Army and the NCO Corps. Along with the rank of sergeant, the corporal is the only rank that never has disappeared from the NCO Corps. The rank of corporal always has been placed at the base of the NCO ranks. For the most part, corporals have served as the smallest unit leaders in the Army: principally, leaders of teams. Like the grade of sergeant, corporals are responsible for individual training, personal appearance and cleanliness of their soldiers. As the command sergeant major is known as the epitome of success in the NCO Corps, the corporal is the beginning of the NCO Corps. As the NCO Corps is known as the backbone of the Army, the corporal is the backbone of the NCO Corps.