The Indian military consists of the Indian Army, Indian Navy, and Indian Air Force. It also utilizes several paramilitary forces. The Indian Army is the second largest standing army in the world with over 2 million active and reserve personnel. The Indian Navy is the fifth largest navy globally operating over 100 vessels. The Indian Air Force is the fourth largest air force with over 1,500 aircraft. Key paramilitary forces include the Assam Rifles, Special Frontier Force, Indian Coast Guard, Border Security Force, Central Reserve Police Force, Indo-Tibetan Border Police and others that assist the military in securing India's borders and maintaining internal security.