Enlisted personnel are identified by way of their various 'E' grades ranging from E-1 to E-9. For those service branches recognizing a Warrant Officer rank, 'W' grades range from W-1 to W-5. Likewise Officers are scaled from O-1 to O-10.
China has quite a collection of natural bridges, including one that experts say has the longest span of any natural bridge in the world. The Fairy Bridge (Xianren Qiao), in southwestern China's Guangxi Zhuang Autonomous Region near the border with Vietnam, has a 400-foot span.
Fairy Bridge or Xianren Bridge, China. Xianren Bridge, also known as Fairy Bridge, is the world's largest natural arch with a span measuring 400 feet or 120 meter. The bridge is carved through the limestone karst by the Buliu River. It is located about 40 km northwest of Fengshan in northwestern Guangxi Province, China.