$1M/day...
Okay, assuming $50k/yr cost per person, that's something like $135/day for each "cop". That's like 7000 people if salary was the only thing.
Since I don't think there are even 1000 of them deployed in DC, then there's a lot of overhead going somewhere else. Uniforms, admin, whatever. Likely some good old fashioned corruption and grift.
Also, I'm kind of surprised that number is that low.