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.
Located just 5 miles (8 km) north of Moab is Arches National Park, which contains the world's largest concentration of natural sandstone arches. Although over 2,000 arches are located within the park's 76,518 acres, the park also contains an astounding variety of other geological formations.