Pentagon

The Pentagon is the command center of the United States Department of Defense, located at 48 N. Rotary Road, Arlington, Virginia 22211. Its mailing address is "Washington, DC 20301." As a symbol of the US military, "the Pentagon" is often used metonymically to refer to the Department of Defense rather than the building itself.

Background
Built by Philadelphia contractor John McShain, the building was dedicated on January 15, 1943. It is the highest-capacity office building in the world and one of the world's largest buildings in terms of floor area. It houses approximately 23,000 military and civilian employees and about 3,000 non-defense support personnel. It has five sides, five floors above ground (plus two basement levels), and five ring corridors per floor with a total of 17.5 miles (28 km) of corridors.

First Tiberium War
During the First Tiberium War, Seth ordered an ambitious commander to attack the Pentagon, supposedly in hopes to render the United States' center of military operations useless. However, this plan was never carried out. Considering the strength of the United States during the First Tiberium War, it was likely the mission was meant to be a failure as a way to get rid of the commander.

Third Tiberium War
The Pentagon is now a vital element of the GDI defence system for the United States Eastern Seaboard. In March 2047, the Pentagon came under heavy attack from Nod forces shortly after the Philadelphia's destruction and Nixon's capture, rendering the Pentagon the sole remaining major GDI command center. Nod Militia managed to destroy the power supply to its Watchtower defences, rendering it almost completely defenceless. Thanks to the timely intervention of a resourceful GDI commander the building was successfully defended, with help from APC platoons and Grenadier squads that also arrived in the nick of time. This also proved the point where attacking the Pentagon was a suicide mission.

Trivia

 * During the First Tiberium War, ﻿Seth was about to send a rising Nod commander to attack the Pentagon knowing full well it was a suicide mission. Kane however revoked the order. Ironically, at the start of the Third Tiberium War, this would eventually be proven true as a less competent Nod officer attempted to take out GDI's last global command center, only to be killed doing so by the GDI commander.

Third World War (first iteration)
The Pentagon was the United States' (and by extension the Allies') military command center. As the supreme Allied military commander, General Carville worked and often briefed his commanders there.

Early in the Third World War, when the Soviet Union invaded the US, they managed to overrun Washington DC. While the American government and high-ranking military officers were evacuated to Canada for a time, the Allies still managed to hold onto the Pentagon. Their hold on the command center was reinforced when Albert Einstein lent his plans for the Prism Tower to the Americans, forcing the Soviet armor to back off their raids on the Pentagon. The structure was further defended when the US, with European reinforcements, staged their counterattack to liberate Washington DC from the occupying Soviets.

Carville was later seen glad to have his office back and home once again. Later a Crazy Ivan somehow infiltrated the Pentagon and assassinated Carville who was about to leave for Germany.

In the non-canon Soviet campaign, the Pentagon was the first building to be targeted during the Soviet invasion of the US. Caught by surprise the Allied GIs were no match to the numerous Soviet conscripts who overran the small outposts and later swarmed their way in to crush the Pentagon. The loss of the Americans' major command center, as well as key US officers, left their military disorganised and unable to coordinate a response, contributing to the Americans' eventual capitulation.