On This Day
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1,000 workers complete air conditioning system for Pentagon

The Pentagon is the headquarters building of the United States Department of Defense, in Arlington County, Virginia, across the Potomac River from Washington, D.C.

The Pentagon is the headquarters building of the United States Department of Defense, in Arlington County, Virginia, across the Potomac River from Washington, D.C. The building was constructed on an accelerated schedule during World War II. As a symbol of the U.S. military, the phrase The Pentagon is often used as a metonym for the Department of Defense and its leadership.

The building was designed by American architect George Bergstrom and built by contractor John McShain. Ground was broken on 11 September 1941, and the building was dedicated on 15 January 1943. General Brehon Somervell provided the major impetus to gain Congressional approval for the project. Colonel Leslie Groves was responsible for overseeing the project for the U.S.

Historical Significance

The Pentagon is the headquarters building of the United States Department of Defense, in Arlington County, Virginia, across the Potomac River from Washington, D.

Events Before

  1. World War II: Representatives of 26 nations at war with the Axis powers sign the Declaration of the United Nations, pled

    World War II: Representatives of 26 nations at war with the Axis powers sign the Declaration of the United Nations, pledging to make no separate peace deals

  2. The US and 25 other countries sign the Declaration by United Nations against the Axis

    The Declaration by United Nations was the main treaty that formalized the Allies of World War II and was signed by 47 national governments between 1942 and 1945.

  3. Nazi officials hold the notorious Wannsee Conference in Berlin to coordinate the "Final Solution", the extermination of

    Nazi officials hold the notorious Wannsee Conference in Berlin to coordinate the "Final Solution", the extermination of Europe's Jews

  4. Novelist Anthony Burgess (25) weds Llewela Jones

    Novelist Anthony Burgess (25) weds Llewela Jones

  5. Glenn Miller and his Orchestra are awarded the first-ever gold record for selling 1 million copies of "Chattanooga Choo

    Glenn Miller and his Orchestra are awarded the first-ever gold record for selling 1 million copies of "Chattanooga Choo Choo"

Events After

  1. D-Day: The Normandy Landings

    Allied forces launch the largest amphibious invasion in history on the beaches of Normandy, France, marking the beginning of the liberation of Western Europe from Nazi occupation.

  2. Omar al-Bashir is born

    Omar al-Bashir is born

  3. Army defeats Navy 10-7 in football "Arab Bowl," Oran, North Africa

    Army defeats Navy 10-7 in football "Arab Bowl," Oran, North Africa

  4. Siege of Leningrad lifted by the Soviets after 880 days and more than 2 million Russians killed

    Siege of Leningrad lifted by the Soviets after 880 days and more than 2 million Russians killed

  5. Battle of Eniwetok: US forces take Enewetak Atoll at the cost of 37 Americans killed or missing and 94 wounded; Japanese

    Battle of Eniwetok: US forces take Enewetak Atoll at the cost of 37 Americans killed or missing and 94 wounded; Japanese losses are 800 dead and 23 prisoners

More from the 1940s

D-Day: The Normandy Landings

Allied forces launch the largest amphibious invasion in history on the beaches of Normandy, France, marking the beginning of the liberation of Western Europe from Nazi occupation.

wars conflicts

World War II: Representatives of 26 nations at war with the Axis powers sign the Declaration of the United Nations, pled

World War II: Representatives of 26 nations at war with the Axis powers sign the Declaration of the United Nations, pledging to make no separate peace deals

Mahatma Gandhi begins a march for peace in East Bengal

Mohandas Karamchand Gandhi (2 October 1869 – 30 January 1948) was an Indian lawyer, anti-colonial nationalist, and political thinker who employed nonviolent resistance to lead the successful campaign…

birth

Omar al-Bashir is born

Omar al-Bashir is born

Frequently Asked Questions

What happened on January 15, 1943?
The Pentagon is the headquarters building of the United States Department of Defense, in Arlington County, Virginia, across the Potomac River from Washington, D.C. The building was constructed on an accelerated schedule during World War II. As a symbol of the U.S.
Why is 1,000 workers complete air conditioning system for Pentagon significant?
The Pentagon is the headquarters building of the United States Department of Defense, in Arlington County, Virginia, across the Potomac River from Washington, D.

Explore More

January 15 in HistoryYear 1943