Good point...most great men and women are in the military!
My belief, as I posted in another thread, is the military would be dispatched to the cities with orders not to shoot, similar to the Afghan rules of engagement. Of course, they will defend government property. The ruling class does not trust the military to shoot Americans and will take this action to avoid a mutiny.
On the other hand, the militarized bureaucracy would be dispatched to the immediate suburbs to "protect" those areas from roaming mobs from the city. Of course, citizens would be disarmed "for their own good," food would be seized to avert a "food crisis" and neighborhoods would be "locked down" for security. DHS/TSA/Park Ranger types will shoot if ordered to "maintain law and order." These are not the same caliber of people as those who join the military. Most are in it for the money and power trip.