"Leatherneck" is a nickname for members of the United States Marine Corps. The term originated in the 18th century when Marines wore a leather stock around their necks as part of their uniform, which helped maintain a stiff posture. Over time, the name became synonymous with the Marine Corps and its traditions. The Marine Corps is known for its rigorous training and commitment to discipline, making "Leatherneck" a symbol of pride and resilience. The nickname reflects the Marines' tough reputation and their role as elite military forces in various conflicts throughout history.