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.
Established in 1926. The sandstone arch that is called Natural Bridge has stood for millenniums. The arch is 78 feet long, 65 feet high, 12 feet thick and 20 feet wide. Some geologists believe that the stunning natural sandstone arch is at least a million years old. There are other natural archways in the area, but none have gained the prominence of Natural Bridge.