A Reserve Officers’ Training Corps instructors (ROTC instructor) prepares college students for positions in the armed forces. Your duties focus on providing training that prepares students for leadership roles in the military as commissioned officers. An ROTC instructor works for the branch of the armed services in which they served, such as the Air Force, Navy, Army, Marines, or Coast Guard. Your responsibilities vary slightly depending on the branch of the military, but these training programs typically involve classroom work, fitness activities, and training in the field.