The Pentagon was the largest military command center in the world. 
When it was finished in record time in 1943, the construction manager, Col. Leslie Groves, did so well that he was promoted to major general and put in charge of something even bigger, the Manhattan Project, which built multiple, large facilities across the United States to put together the world's first atomic bomb. 
                        
                        
                        
                        
                        
                            
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                            John Mills ✉
                            Col. John Mills, ret., served 33 years in the Army and also as a senior civilian in government and at national security-related think tanks.  He is the former director of cybersecurity policy in the Office of the Secretary of Defense.