The armed forces of Yemen include the Yemen Army (includes Republican Guard), Navy (includes Marines), 1st Armored Division, Yemeni Air Force (Al Quwwat al Jawwiya al Yamaniya, which includes the Air Defense Force) (2008). A major reorganization of the armed forces continues. The unified air forces and air defenses are now under one command. The navy has concentration in Aden. Total armed forces manning numbers about 401,000 active personnel, including conscripts. The Yemen Arab Republic and the People's Democratic Republic of Yemen joined to form the Republic of Yemen on 22 May 1990.