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.
Where. USA Arches National Park,Utah. The longest natural arches in the world are both in Utah, USA, which span openings of equal width. Landscape Arch, in Arches National Park, and Kolob Arch, in Zion National park, both stand over openings 94.5 m (310 ft) wide.