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.
Royal Gorge Bridge, USA. Located in CaÃ±on City, Colorado, itâs actually a tourist attraction. It was built in 1929 and was, until 2003, the highest bridge in the world, with a height of 1,053 feet. The structure is 291m-high.