Extensive military infrastructure facilities have been built to ensure the comfort and well-being of national guard units. Their major cantonments were in Al-Ahsa Oasis near Al-Hufuf and the major oil installations of the Eastern Province and at Al-Qasim in the Nejd, in an area where many of the tribal elements were recruited and most training was conducted. A large new housing project for guard personnel, with associated schools, shops, and mosques, has been constructed near Riyadh, also the site of the guard's military academy, the King Khalid Military College. Other National Guard military cities were located at At-Ta'if, Dammam, and Jeddah, while a new headquarters complex was built in Riyadh in the early 1980s.