In his interview with the Daily Show, former Defense Secretary Donald Rumsfeld told Jon Stewart that "there are 3 million people in that operation," referring to the Pentagon.
Newsflash: The Pentagon has about 23,000 employees, non-military and civilian. Even if Rumsfeld was including the entire military (which is quite possible) the total number comes to about 2.3 million. Here are some other Pentagon numbers, for those who are interested.
There are 131 stairways in the Pentagon, and 19 escalators. There are 4,200 clocks, 691 water fountains, 284 rest rooms, 1 dining room, 2 cafeterias, and 7 snack bars.
The interview is really quite interesting, I've included the link above. I know this isn't my field of expertise, but I thought it worth mentioning.