It includes 13 zones – each with its own specific role – making it the world's largest defense headquarters and office building complex surpassing The Pentagon in the United States of America.[6][7] The Octagon is a part of a big establishment, which as a whole has worship venues, clubs, hotels, schools, playgrounds, residential projects, shopping malls, hospitals, and complexes for civil and administrative services. The place is secured by two Republican Guard units, and other means of security.[8]