A Pentagon official, who spoke on the condition of anonymity on Friday, described the mood inside the building as “eerie.”

“Obviously it’s close to the holidays so you don’t expect to see a lot of people, but there’s just a general fear of the unknown,” the official said…

“Imagine a mentor or a friend, someone you thought would be there for the entirety of your tour, someone who everyone thought really highly of, suddenly not there anymore. … People are really bummed,” the Pentagon official said.