The defence industry of Pakistan, under the Ministry of Defence Production, was created in September 1991 to promote and coordinate the patchwork of military production facilities that have developed since independence. The ministry also includes seven other specialized organizations devoted to research and development, production, and administration. The navy is supported mainly by a facility at the Karachi Shipyard, which has limited production capacity. In 1987 development of a submarine repair and rebuild facility at Port Qasim was begun. By early 2000, in a joint project with China led to the development of the JF-17 Thunder fighter and the Al-Khalid Tank. Pakistan also has taken major steps to becoming self-sufficient in aircraft overhaul, modernization and tank and helicopter sales