The Brigade is divided into two regiments of three battalions each. Five companies make up each battalion, for a total of 30 companies. The midshipman command structure is headed by a first class midshipman known as the brigade commander, chosen for outstanding leadership performance. He or she is responsible for much of the brigade's day-to-day activities as well as the professional training of midshipmen. Overseeing all brigade activities is the commandant of midshipmen, an active-duty Navy captain or Marine Corps colonel. Working for the commandant, experienced Navy and Marine Corps officers are assigned as company and battalion officers.