The current Secretary of Defense is James Mattis. He is the 26th Secretary of Defense under the Trump Administration. He served in the military from 1969-2013. He has won many awards including the Distinguished Service Medal, Defense Superior Service Award, Legion of Merit, the Bronze Star Medal with Valor, 2 Defense Distinguished Service medals, and 3 Meritorious Service Medals.
The Pentagon was designed by architect George Bergstrom, and built by general contractor John McShain. During the 1940's the U.S. was consumed with war anxiety as Adolf Hitler was gaining control of Europe. The War Department needed headquarters fast but the original design for the building was too large to fit in Washington. In order to save time, the building was constructed to look like a pentagon.