identify with The Pentagon since you worked there so long, and in service to Our Country! Thank you.
And just interesting to hear someone give a more detailed description of the physicality, and hustle bustle of the place; usually in TV, and movies it's short bits of hallway, then people walk into a room of various kinds. Plus your photos add more, too!
I'm a native NYC'r and spent almost a whole year about 18 years, and 49 weeks -Ago- to the 9-11 date in the South Tower (#2) on the 73rd Flr in a big open NE corner office.
Where I feel a link is you mentioning the Pentagon's Concourse - bookstore, cafeteria et al.
Below ground, and in between, and at the sides of the Twin Towers was a massive Concourse!
Cafes, food kiosks, drugstores, eyeglass places, banks, clothing shops, ice cream kiosk (Ben & Jerry's), doughnut shop, newspaper stands, at least one book store 🙂 and more.
I spent a lot of time there after work. And way after that because I worked in different parts of Lower Manhattan, I often picked up stuff after work since I could get so many different things I needed.
I hadn't thought about the Concourse yesterday ~ thanks for helping me remember. 
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