Pentagon

The Pentagon is a huge, five-sided office building located just outside of Washington, D.C. in the United States of America. It is the headquarters of the United States military.

Marvel The Transformers comics
Hawk attended an emergency meeting at the Pentagon where he learned that his love interest, Senator Barbara Larkin, was a corrupt Cobra collaborator. Hawk was at the Pentagon when he communicated with Serpentor and Blaster in deciding what the best way was to stop the Decepticons from using Power Station Alpha to destroy the Earth.

Dreamwave Generation One continuity
Two years after the Ark II disaster, Spike Witwicky was brought to the Pentagon by General Robert Hallo. The massive office building was home to all manner of sinister machinations, not to mention Larry the Janitor. General Hallo led Spike to the Development of War Technology Division's headquarters, a "window on the world," where satellites kept the DWT abreast of events from around the globe. While one of the Division's officers calmly watched a nuclear explosion, Hallo showed Spike some pictures, satellite images of the revived Megatron.

Later, after witnessing General Hallo's Operation Clean-Up against the battling Transformers, Spike was returned to the Pentagon by helicopter and locked in a cell. Since janitors routinely have keys to the detention cells, Spike was freed by Larry, who gave him some papers about the Lazarus Project. Spike thanked him by throwing him to the floor and stealing his security pass.

Armed with the deadly papers, Spike stormed the DWT Division headquarters. Inside the DWT, Hallo had just performed a military miracle by single-handedly launching nuclear missiles—at an American city, no less. Confronted with the terrifying Spike and his scary papers, Hallo pulled a pistol and held Spike off long enough to rant about power and security. Then the President of the United States showed up with the Secret Service and "Defense Minister" Dawson to arrest Hallo, who chose instead to get shot to death for waving a pistol at armed military personnel.

IDW Generation 1 continuity
Ramjet had successfully placed a facsimile agent named Harrison in the Pentagon, who gave him the access codes to the United States nuclear arsenal. Megatron later threw Ramjet's severed arm through the wall.

Somehow, the wall was miraculously fixed when the Pentagon organised a meeting about the Ark-19 appearing in U.S. airspace.

Prime cartoon
Special Agent William Fowler, the Autobot liaison with the United States government, reports direct to the Pentagon. When it comes to the Decepticon threat, he'd prefer to get the United States Department of Defense involved than leave it to the Autobots, but holds back to avoid civilian casualties.