The Second Artillery Corps (SAC) (第二炮兵部队) is the strategic missile forces of the People's Republic of China. The SAC is a major division of the People's Liberation Army that controls China's nuclear and conventional strategic missiles. China's total nuclear arsenal size is estimated to be between 100 and 400 nuclear weapons. The SAC is comprised of approximately 90,000-120,000 personnel and six ballistic missile brigades. The six brigades are independently deployed in different military regions. Music: The name of this song is "Huo Yuan Jia" sing by Jay Chou. This song is the theme song of Jet Li movie "Fearless"!