The U.S. Marine Corps Reserve is a branch of the United States Marine Corps that allows individuals to serve part-time while maintaining civilian careers or education. Reservists typically train one weekend a month and participate in annual training, ensuring they are ready to support active-duty Marines when needed. Established in 1916, the Marine Corps Reserve plays a vital role in national defense and can be called upon during emergencies or military operations. Reservists may serve in various roles, including combat, logistics, and support, contributing to the overall mission of the U.S. Department of Defense.