This is basically just an interesting little "did you know?" graphic, courtesy of The Economist. In this case, I'll admit that I did not know exactly how large our DoD was. The USPS, incidentally, is the 2nd-largest employer of domestic civilians in the U.S., but its ~575k full-time employees don't hold a match to some of our country's multinational corporate giants.
Walmart vs. Chinese People's Liberation Army... who ya got?