The Pentagon is the headquarters of the United States Department of Defense, located in Arlington County, Virginia, across the Potomac River from Washington, D.C. As a symbol of the U.S. military, The Pentagon is often used metonymically to refer to the U.S. Department of Defense. The Pentagon was designed by American architect George Bergstrom (1876–1955), and built by general contractor John McShain of Philadelphia. Ground was broken for construction on September 11, 1941, and the building was dedicated on January 15, 1943. General Brehon Somervell provided the major motivating power behind the project; Colonel Leslie Groves was responsible for overseeing the project for the U.S. Army. The Pentagon is the world's largest office building, with about 6,500,000 sq ft (600,000 m2), of which 3,700,000 sq ft (340,000 m2) are used as offices. Approximately 23,000 military and civilian employees and about 3,000 non-defense support personnel work in the Pentagon. It has five sides, five floors above ground, two basement levels, and five ring corridors per floor with a total of 17.5 mi (28.2 km) of corridors. The Pentagon includes a five-acre (20,000 m2) central plaza, which is shaped like a pentagon and informally known as "ground zero," a nickname originating during the Cold War on the presumption that it would be targeted by the Soviet Union at the outbreak of nuclear war. On September 11, 2001, exactly 60 years after the building's construction began, American Airlines Flight 77 was hijacked and flown into the western side of the building, killing 189 people (59 victims and the five perpetrators on board the airliner, as well as 125 victims in the building), according to the official report. It was the first significant foreign attack on Washington's governmental facilities since the city was burned by the British during the War of 1812.
1.1 Construction 1.2 Protests 1.3 Renovation 1.4 September 11 attacks 1.5 Shooting incidents 1.6 Earthquake
2 Layout 3 Security 4 Hall of Heroes 5 Services 6 Other uses 7 See also 8 References 9 External links
1945 map of the Pentagon road network, including present-day State Route 27 and part of the Shirley Highway, as well as the Main Navy and Munitions Buildings near the Lincoln Memorial.
Before the Pentagon was built, the United States Department of War was headquartered in the Munitions Building, a temporary structure erected during World War I along Constitution Avenue on the National Mall. The War Department, which was a civilian agency created to administer the U.S. Army, was spread out in additional temporary buildings on the National Mall, as well as dozens of other buildings in Washington, D.C., Maryland and Virginia. In the late 1930s a new War Department Building was constructed at 21st and C Streets in Foggy Bottom but, upon completion, the new building did not solve the department's space problem and ended up being used by the Department of State. When World War II broke out in Europe, the War Department rapidly expanded in anticipation that the United States would be drawn into the conflict. Secretary of War Henry L. Stimson found the situation unacceptable, with the Munitions Building overcrowded and the department spread out. Stimson told U.S. President Franklin D. Roosevelt in May 1941 that the War Department needed additional space. On July 17, 1941, a congressional hearing took place, organized by Virginia congressman Clifton Woodrum, regarding proposals for new War Department buildings. Woodrum pressed Brigadier General Eugene Reybold, who was representing the War Department at the hearing, for an "overall solution" to the department's "space problem" rather than building yet more temporary buildings. Reybold agreed to report back to the congressman within five days. The War Department called upon its construction chief, General Brehon Somervell, to come up with a plan.
Main Navy Building (foreground) and the Munitions Building were temporary structures built during World War I on the National Mall. The Munitions Building served as the Department of War headquarters for several years before moving into the Pentagon.
Southwesterly view of the Pentagon in 1998, with the Potomac River and Washington Monument in background.
Government officials agreed that the War Department building, officially designated Federal Office Building No 1, should be constructed across the Potomac River, in Arlington County, Virginia. Requirements for the new building were that it be no more than four stories tall, and that it use a minimal amount of steel. The requirements meant that, instead of rising vertically, the building would be sprawling over a large area. Possible sites for the building included the Department of Agriculture's Arlington Experimental Farm, adjacent to Arlington National Cemetery, and the obsolete Hoover Field site. The site originally chosen was Arlington Farms which had a roughly pentagonal shape, so the building was planned accordingly as an irregular pentagon. Concerned that the new building could obstruct the view of Washington, D.C., from Arlington Cemetery, President Roosevelt ended up selecting the Hoover Airport site instead. The building retained its pentagonal layout because a major redesign at that stage would have been costly, and Roosevelt liked the design. Freed of the constraints of the asymmetric Arlington Farms site, it was modified into a regular pentagon which resembled the star forts of the gunpowder age. On July 28 Congress authorized funding for a new Department of War building in Arlington, which would house the entire department under one roof, and President Roosevelt officially approved of the Hoover Airport site on September 2. While the project went through the approval process in late July 1941, Somervell selected the contractors, including John McShain, Inc. of Philadelphia, which had built Washington National Airport in Arlington, the Jefferson Memorial in Washington, and the National Naval Medical Center in Bethesda, Maryland, along with Wise Contracting Company, Inc. and Doyle and Russell, both from Virginia. In addition to the Hoover Airport site and other government-owned land, construction of the Pentagon required an additional 287 acres (1.16 km2), which were acquired at a cost of $2.2 million. The Hell's Bottom neighborhood, a slum with numerous pawnshops, factories, approximately 150 homes, and other buildings around Columbia Pike, was also cleared to make way for the Pentagon. Later 300 acres (1.2 km2) of land were transferred to Arlington National Cemetery and to Fort Myer, leaving 280 acres (1.1 km2) for the Pentagon. Contracts totaling $31,100,000 were finalized with McShain and the other contractors on September 11, and ground was broken for the Pentagon the same day. Among the design requirements, Somervell required the structural design to accommodate floor loads of up to 150 pounds per square foot, which was done in case the building became a records storage facility at some time after the end of the current war. A minimal amount of steel was used as it was in short supply during World War II. Instead, the Pentagon was built as a reinforced concrete structure, using 680,000 tons of sand dredged from the Potomac River, and a lagoon was created beneath the Pentagon's river entrance. To minimize steel usage, concrete ramps were built rather than installing elevators. Indiana limestone was used for the building's façade.
Northwest exposure of the Pentagon's construction underway, July 1, 1942.
Architectural and structural design work for the Pentagon proceeded simultaneously with construction, with initial drawings provided in early October 1941, and most of the design work completed by June 1, 1942. At times the construction work got ahead of the design, with different materials used than specified in the plans. Pressure to speed up design and construction intensified after the attack on Pearl Harbor on December 7, 1941, with Somervell demanding that 1,000,000 sq ft (9.3 ha) of space at the Pentagon be available for occupation by April 1, 1943. David J. Witmer replaced Bergstrom as chief architect on April 11 after Bergstorm resigned due to charges, unrelated to the Pentagon project, of improper conduct while he was president of the American Institute of Architects. Construction was completed January 15, 1943. The construction of the Pentagon was done during a time when parts of the U.S. were under legally-mandated racial segregation. This had structural consequences to the design of the building. Under the supervision of Colonel Leslie Groves, the decision to have separate eating and lavatory accommodations for white persons and black persons was made and carried out. The dining areas for black persons were put in the basement and on each floor there were double toilet facilities separated by gender and race. These measures of segregation were said to have been done in compliance with the Commonwealth of Virginia's racial laws. The Pentagon as a result has twice the number of toilet facilities needed for a building of its size. U.S. President Franklin Roosevelt issued Executive Order 8802 on June 25, 1941, to end discrimination in the national defense industry on the basis of race, creed, color, or national origin. When the President visited the Pentagon before its dedication, he questioned Groves regarding the number of washrooms and ordered him to remove the 'Whites Only' signs. Until 1965 the Pentagon was the only building in Virginia where segregation laws were not enforced. The soil conditions of the Pentagon site, located on the Potomac River floodplain, presented challenges to engineers, as did the varying elevations across the site, which ranged from 10 to 40 feet (3.0–12.2 m) above sea level. Two retaining walls were built to compensate for the elevation variations, and cast-in-place (Franki) piles were used to deal with the soil conditions. Construction of the Pentagon was completed in approximately 16 months at a total cost of $83 million. The building is approximately 71 feet (22 m) tall, and each of the five sides of the building is 921 feet (281 m) long. Because of the pressing needs of the war, people started working in the Pentagon before it was completed. The Pentagon was built one wing at a time, and after the first wing was finished, employees started to move into that wing while construction was continuing on the other wings. Protests
Military police keep back Vietnam War protesters during their sit-in on October 21, 1967, at the mall entrance to the Pentagon
The Pentagon became a focal point for protests against the Vietnam War during the late 1960s. A group of 2,500 women, organized by Women Strike for Peace, demonstrated outside of Secretary of Defense Robert S. McNamara's office at the Pentagon on February 15, 1967. In May 1967, a group of 20 demonstrators held a sit-in outside the Joint Chiefs of Staff's office, which lasted four days before they were arrested. In one of the better known incidents, on October 21, 1967, some 35,000 anti-war protesters organized by the National Mobilization Committee to End the War in Vietnam, gathered for a demonstration at the Defense Department (the "March on the Pentagon"), where they were confronted by some 2,500 armed soldiers. During the protest, a famous picture was taken, where George Harris placed carnations into the soldiers' gun barrels. The march concluded with an attempt to "exorcise" the building. On May 19, 1972, the American radicals known as the Weather Underground Organization successfully planted and detonated a bomb in a fourth-floor women's restroom in the Pentagon. They announced it was in retaliation for the Nixon administration's bombing attacks on Hanoi during the final stages of the Vietnam War. On March 17, 2007, 4,000 to 15,000 people (estimates vary significantly) protested against the Iraq War. The protesters marched from the Lincoln Memorial, down Washington Boulevard to the Pentagon’s north parking lot. Renovation Main article: Pentagon Renovation Program From 1998 to 2011, the Pentagon underwent a major renovation, known as the Pentagon Renovation Program. This program, completed in June 2011, involved the complete gutting and reconstruction of the entire building in phases to bring the building up to modern standards, removing asbestos, improving security, providing greater efficiency for Pentagon tenants, and sealing of all office windows. As originally built, most Pentagon office space consisted of open bays which spanned an entire ring. These offices used cross-ventilation from operable windows instead of air conditioning for cooling. Gradually, bays were subdivided into private offices with many using window air conditioning units. With renovations now complete, the new space includes a return to open office bays, a new Universal Space Plan of standardized office furniture and partitions developed by Studios Architecture. September 11 attacks Main article: American Airlines Flight 77 On September 11, 2001, the 60th anniversary of the Pentagon's groundbreaking, a team of five al-Qaeda affiliated hijackers took control of American Airlines Flight 77, en route from Washington Dulles International Airport to Los Angeles International Airport, and deliberately crashed the Boeing 757 airliner into the western side of the Pentagon at 9:37 am EDT as part of the September 11 attacks. All 59 civilians and the 5 terrorists on the airliner were killed, as were 70 civilians and 55 military personnel who were in the building. The impact of the plane severely damaged the outer ring of one wing of the building and caused its partial collapse. At the time of the attacks, the Pentagon was under renovation and many offices were unoccupied, resulting in fewer casualties. Only 800 of 4,500 people who would have been in the area were there because of the work. Furthermore, the area hit, on the side of the Heliport facade, was the section best prepared for such an attack. The renovation there, improvements which resulted from the Oklahoma City bombing, had nearly been completed.
It was the only area of the Pentagon with a sprinkler system, and it had been reconstructed with a web of steel columns and bars to withstand bomb blasts. The steel reinforcement, bolted together to form a continuous structure through all of the Pentagon's five floors, kept that section of the building from collapsing for 30 minutes—enough time for hundreds of people to crawl out to safety. The area struck by the plane also had blast-resistant windows—2 inches thick and 2,500 pounds each—that stayed intact during the crash and fire. It had fire doors that opened automatically and newly built exits that allowed people to get out.
Contractors already involved with the renovation were given the added task of rebuilding the sections damaged in the attacks. This additional project was named the "Phoenix Project," and was charged with having the outermost offices of the damaged section occupied by September 11, 2002. When the damaged section of the Pentagon was repaired, a small indoor memorial and chapel were included, located at the point of impact. For the fifth anniversary of the September 11, 2001 attacks, a memorial of 184 beams of light shone up from the center courtyard of the Pentagon, one light for each victim of the attack. In addition, an American flag is hung each year on the side of the Pentagon damaged in the attacks, and the side of the building is illuminated at night with blue lights. After the attacks, plans were developed for an outdoor memorial, with construction underway in 2006. This Pentagon Memorial consists of a park on 2 acres (8,100 m2) of land, containing 184 benches, one dedicated to each victim. The benches are aligned along the line of Flight 77 according to the victims' ages, from 3 to 71. The park opened to the public on September 11, 2008.
Security camera footage of Flight 77 hitting the Pentagon (impact at 1:25)
The Pentagon, minutes after American Airlines Flight 77 crashed into it
A fire at the Pentagon, with police and EMS in the foreground
The Pentagon in April 2002.
9/11 anniversary illumination in 2007.
Shooting incidents Main articles: 2010 Pentagon shooting and Northern Virginia military shootings On March 4, 2010, at 6:40 pm, two police officers working for the Pentagon Force Protection Agency were shot near an entrance to the Pentagon and fired back with their pistols at the suspect. The officers were injured but were treated in a hospital and released. The suspect, identified as John Patrick Bedell (age 36), died at the hospital. No clear motive was established. On October 19, 2010, shortly before 5 am, an unidentified gunman shot at the south side of the building, shattering windows on the third and fourth floors. Earthquake Main article: 2011 Virginia earthquake On August 23, 2011, a 5.8 magnitude earthquake in Mineral, Virginia, shook the Pentagon. The building suffered minor damage, with flooding from broken pipes. Layout
August 2010 aerial view of the Pentagon
The Pentagon (light blue) compared to large ships and buildings: The Pentagon, 1,414 feet, 431 m RMS Queen Mary 2, 1,132 feet, 345 m USS Enterprise, 1,123 feet, 342 m Hindenburg, 804 feet, 245 m Yamato, 863 feet, 263 m Empire State Building, 1,454 feet, 443 m Knock Nevis, ex-Seawise Giant, 1,503 feet, 458 m Apple Park, 1,522 feet, 464 m
The Pentagon building spans 28.7 acres (116,000 m2), and includes an additional 5.1 acres (21,000 m2) as a central courtyard. Starting with the north side and moving clockwise, its five façades are the Mall Terrace Entrance façade, the River Terrace Entrance façade, the Concourse Entrance (or Metro Station) façade, the South Parking Entrance façade, and the Heliport façade. On the north side of the building, the Mall Entrance, which also features a portico, leads out to a 600 ft (180 m) long terrace that is used for ceremonies. The River Entrance, which features a portico projecting out 20 ft (6.1 m), is located on the northeast side, overlooking the lagoon and facing Washington. A stepped terrace on the River Entrance leads down to the lagoon; and a landing dock was used until the late 1960s to ferry personnel between Bolling Air Force Base and the Pentagon. The main entrance for visitors is located on the southeast side, where the Pentagon Metro station and the bus station are located. There is also a concourse on the southeast side of the second floor of the building, which contains a mini-shopping mall. The Pentagon's south parking lot is located on the southwest side of the Pentagon, and the west side of the Pentagon faces Washington Boulevard. The concentric rings are designated from the center out as "A" through "E" (with in addition "F" and "G" in the basement). "E" Ring offices are the only ones with outside views and are generally occupied by senior officials. Office numbers go clockwise around each of the rings, and have two parts: a nearest-corridor number (1 to 10) followed by a bay number (00 to 99), so office numbers range from 100 to 1099. These corridors radiate out from the central courtyard, with corridor 1 beginning with the Concourse's south end. Each numbered radial corridor intersects with the corresponding numbered group of offices (for example, corridor 5 divides the 500 series office block). There are a number of historical displays in the building, particularly in the "A" and "E" rings. Floors in the Pentagon are lettered "B" for Basement and "M" for Mezzanine, both of which are below ground level. The concourse is located on the second floor at the Metro entrance. Above ground floors are numbered 1 to 5. Room numbers are given as the floor, concentric ring, and office number (which is in turn the nearest corridor number followed by the bay number). Thus, office 2B315 is on the second floor, B ring, and nearest to corridor 3 (between corridors 2 and 3). One way to get to this office would be to go to the second floor, get to the A (innermost) ring, go to and take corridor 3, and then turn left on ring B to get to bay 15. It is possible for a person to walk between any two points in the Pentagon in less than seven minutes. Just south of the Pentagon are Pentagon City and Crystal City, extensive shopping, business, and high-density residential districts in Arlington. Arlington National Cemetery is to the north. The Washington Metro Pentagon station is also located at the Pentagon, on the Blue and Yellow Lines. The Pentagon is surrounded by the relatively complex Pentagon road network. The United States Postal Service has established six ZIP Codes for The Pentagon, to which the place name “Washington, D.C.” is assigned, even though The Pentagon is actually located in Virginia. The Secretary of Defense, the Joint Chiefs of Staff, and the four service branches each have their own designated ZIP Code.
The Pentagon, south parking lot side
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The Pentagon Force Protection Agency (PFPA) is the United States government agency composed of sworn federal police officers, the United States Pentagon Police and civilian CBRN technicians, and non-sworn civilian anti-terrorism investigative and physical security personnel, and is responsible for the protection of the Pentagon. The Department of Defense created the PFPA after the September 11, 2001 attacks. The new agency absorbed the Defense Protective Service (DPS) and assumed its role of providing basic law enforcement and security for the Pentagon and Department of Defense sites in the 280 acre (1.1 km2) "Pentagon Reservation" and greater National Capital Region (NCR). PFPA was also charged with providing force protection against the full spectrum of potential threats through robust prevention, preparedness, detection, and response measures. The United States Pentagon Police is the primary federal law enforcement arm of the Pentagon Force Protection Agency. Hall of Heroes
The entrance to the Pentagon’s Hall of Heroes is located on the main concourse
Retired U.S. Army major Ed Freeman is inducted into the Hall of Heroes in July 2001, following his receipt of the Medal of Honor for his service in the Vietnam War. The Hall of Heroes original location was in the A Ring, on the second floor.
Located on the Pentagon's main concourse is the Hall of Heroes, a room dedicated to the more than 3,460 recipients of the Medal of Honor, the United States' highest military decoration.  There are three different versions of the Medal of Honor: the Army version, the Sea Service version (Marine Corps, Navy and Coast Guard), and the Air Force version. All three versions are displayed in the Hall of Heroes. Along the walls of the room are the names of each recipient. An asterisk next to some of the names denotes service members who received two Medals of Honor for two separate acts of bravery. Dots next to other names denote Marines who were under the command of the Army during World War I and received both the Army and Sea Service versions of the Medal of Honor for a single act of bravery. The Hall of Heroes was opened during a Medal of Honor awards ceremony on May 14, 1968. President Lyndon Johnson officiated the ceremony and awarded the Medal of Honor to four serviceman: Specialist 5 Charles C. Hagemeister, U.S. Army; Sergeant Richard A. Pittman, U.S. Marine Corps; Boatswain's Mate 1st Class James E. Williams, U.S. Navy and Captain Gerald O. Young, U.S. Air Force. It was the first time that all four services were represented in a Medal of Honor Ceremony. The medals were awarded in the Pentagon's center courtyard. Upon the ceremony's conclusion, President Johnson ascended a staircase to his rear and cut a red ribbon in front of a door at the top of the stairs providing entrance to the Hall of Heroes. At the time of the dedication, the Hall of Heroes was located on the Pentagon's second floor, A Ring, overlooking the courtyard. As part of the Pentagon's renovation, the Hall of Heroes was moved to its current location on the main concourse. The Hall of Heroes is also used for promotions, retirements, and other types of award ceremonies. Services The Pentagon has over 20 of its own fast food operations, including Subway, McDonald's, Dunkin' Donuts, Panda Express, Starbucks and Sbarro, among others. A multibranded KFC, Pizza Hut, and Taco Bell restaurant opened in 2003, when renovations to the food court were completed. Food services are managed by the Navy Exchange. The Center Courtyard Cafe reopened in the spring of 2008, replacing the "Ground Zero Cafe" snack bar that was previously there. The Pentagon Athletic Center (PAC), a fitness center for military and civilian staff, opened in 2004 adjacent to the north side of the Pentagon, replacing the Pentagon Officers Athletic Club (POAC) which had operated for 55 years in a structure between Route 110 and the parade grounds. Each year, the Pentagon grounds are a major focus for hosting the Marine Corps Marathon and the Army Ten-Miler running events. There is a Meditation and Prayer Room in the Pentagon, which was dedicated on December 14, 1970, by Secretary of Defense Melvin Laird. On September 11, 2002 the Pentagon Memorial Chapel was dedicated. In conjunction with the 1976 American Bicentennial, the Pentagon began offering guided tours to the general public. Tours were suspended after the September 11, 2001 attacks, but are currently available to the general public with reservations 14–90 days in advance. Other uses The Pentagon and its parking lots are used as a staging area for a number of large events, including the Army Ten-Miler, the Marine Corps Marathon and Rolling Thunder motorcycle ride. In 2005, the Department of Defense organized the "America Supports Your Freedom Walk" in the parking lot, an event held to show solidarity with the department's current and former employees. The roads of the Pentagon Reservation are used daily by thousands of commuters between Arlington, Virginia and Washington, D.C. The Pentagon was listed on the National Register of Historic Places in 1989, and was designated a National Historic Landmark in 1992. See also
Architecture portal Military of the United States portal
Ministry of Defence Main Building, London HaKirya, the Israel Defense Forces Headquarters List of National Historic Landmarks in Virginia Main Building of the Ministry of Defense, Russian equivalent National Register of Historic Places listings in Arlington County, Virginia Supreme Headquarters Allied Powers Europe—Structure with similar purposes for NATO. Hexagone Balard
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(June 23, 2000) "Pentagon's hall of heroes welcomes asian-american veterans". Gannett News Service. Retrieved December 1, 2013 [permanent dead link] ^ Staff writer, (March 30, 1991) "Pentagon's gulf war spokesman retires". St.Petersburg Times. Retrieved on December 1, 2013 [permanent dead link] ^ Omicinski, J. (December 1, 1999) "Comanche code-talkers honored for WWII service". Gannett News Service. Retrieved on December 3, 2013 [permanent dead link] ^ Staff writer (February 26, 2004) "Readiness award". The Charleston Gazette. Retrieved on December 2, 2013 [permanent dead link] ^ "Concessions – The Pentagon". Office of the Assistant Secretary of Defense for Public Affairs. Retrieved March 30, 2008. ^ "Pentagon Gets New KFC/Pizza Hut/Taco Bell Multibranded Restaurant". AllBusiness. August 13, 2003. Archived from the original on February 6, 2008. ^ "Center Courtyard Cafe" (PDF). Pentagon Renovator Newsletter. February 2008. 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Carroll, James (2007). House of War: The Pentagon and the Disastrous Rise of American Power. Mariner Books. ISBN 0-618-18780-4. Goldberg, Alfred (1992). The Pentagon: The First Fifty Years. Office of the Secretary of Defense / Government Printing Office. ISBN 0-16-037979-2. Vogel, Steve (2007). The Pentagon – A History: The Untold Story of the Wartime Race to Build the Pentagon and to Restore it Sixty Years Later. Random House. ISBN 0-8129-7325-9.
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