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.
1. Danyang Kunshan Grand Bridge â 164,800 meters. The Danyang Kunshan Grand Bridge is, by far, the longest bridge in the world. Its length difference to the second longest bridge in the world is enough to make it the fifth longest bridge in the world. It is a viaduct completed in 2010 to serve train traffic.