
what is pentagon usa
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Enhanced PromptPentagon, USA, prominent defense headquarters, five-sided building, located in Arlington County, Virginia, near Washington D.C., headquarters of the United States Department of Defense, home to the Joint Chiefs of Staff, largest office building in the world, built in the 1940s, designed by American architect George Bergstrom, construction completed in 1943, original name was the Pentagon Building, officially known as the Pentagon, cost approximately $83 million to build, 34 acres in size, contains more than 6.5 million square feet of space, includes 29 elevators, 13.8 miles of corridors, and over 650 offices, serves as the nerve center of U.S. military operations, houses various branches of the armed forces, including Army, Navy, Air Force, Marine Corps, and Coast Guard, features a distinctive five-sided design with a central courtyard, surrounded by five concentric rings of office space, exterior walls made of Indiana limestone, interior walls constructed of marble, granite, and aluminum, roof covered with asphalt shingles, secured by multiple checkpoints and surveillance systems, accessible only to authorized personnel, has undergone several renovations and expansions since its completion, remains one of the most recognizable landmarks in the United States, security measures include biometric identification, metal detectors, and canine patrols, strict access controls enforced by the Pentagon Police Department, employees and visitors must undergo rigorous screening before entering the facility, serves as a symbol of American military strength and defense capabilities, plays a critical role in national security decision-making processes, hosts numerous high-level meetings and briefings, and serves as a hub for international diplomacy and cooperation.