OK, I was engaging in a teeny bit of hyperbole...But:
That “raw” number includes all LEO. I would bet, based on about thirty years of “casual” conversation that: 1) Many of the nominal LEO’s such as park rangers, “door shakers”, CBP officers, US Fish & Wildlife officers, prison guards, , etc., would not be deployed and/or could not be deployed and/or are completely ill prepared and 2) Many, if not most local LEO’s would simply not turn on the public in the manner one might expect from the Feebies and BATFE.
You might be surprised. The USDA has more than doubled the number of rangers qualified to carry weapons in the last 20 years. They also, in the bigger parks, have SWAT style training and do it with some regularity. The BLM has rangers that a SWAT trained. I have been told that the scenario is that first line cops (trained and do it everyday) will be backed up by MP's and the desk type cops will do support functions; such as detentions and "detainee" control. Every major venue in every city has been analyzed for the use as a detainment camp. In the LA riots after the Rodney King thing they were (according to some cops) ready to turn the Coliseum into a jail. Somebody pointed out that penning all the thugs together would make it worse and that the LAPD was going to get sued! Lol lawyer plus. IMHO you could count on less than 15% of LOE's to go with the citizenry. There has been a major push in law enforcement to dumb cops down in the last 20 years. Individual thinking is not allowed and you cannot question authority or they find a way to get rid of you. The old time cops that consider themselves "peace officers" are retiring in droves and do so on the first possible date. Next time you see a herd of cops take note of the average age. Also many forces have gone out of their way to hire minorities and put them in places of power. You draw your own conclusion on that.
You might want to Google "Operation Vampire Killer 2000" and do some reading, interesting.