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.
Construction on the Arch began in 1963 and was completed in 1965. Since it opened, the Arch has been one of St. Louisâ most popular attractions with millions of people visiting every year. Facts About the Arch: The Gateway Arch is 630 feet tall, making it the tallest national monument in the country. It is also 630 feet wide at its base and weighs more than 43,000 tons.