How Many US Troops Are Fighting ISIS ???

This report claims that our forces fighting ISIS are top heavy:

There are only 5,000 U.S. troops in Iraq—about what a colonel usually commands. But for this ISIS war, as many as 21 generals have been deployed. Why?

In the war against the self-proclaimed Islamic State, the U.S. military is notably short on soldiers, but apparently not on generals.

There are at least 12 U.S. generals in Iraq, a stunningly high number for a war that, if you believe the White House talking points, doesn’t involve American troops in combat. And that number is, if anything, a conservative estimate, not taking into account the flag officers running the U.S. air war, the admirals helping wage the war from the sea, or their superiors back at the Pentagon.

You can read the rest@
http://www.thedailybeast.com/articles/2016/03/31/exclusive-21-generals-lead-an-isis-war-the-u-s-denies.html

But contrast that with another set of facts:

Since World War II ended, the number of general or flag officers per uniformed personnel has been increasing — reaching an all-time high in 2010 of nearly 7 general and flag officers per every 10,000 uniformed personnel.

Source - http://fabiusmaximus.com/2012/09/10/american-military-force-changed-43153/

That implies these 21 generals are in command of 30,000 troops. Perhaps the other 25,000 are mercenaries.

King George III would have been proud.

Did Congress authorize this? Which bill?