I was in the army and I would say no I wouldn't have followed that order, but I probably would have, begrudgingly have you, if under orders.
I reviewed Katrina videos this weekend, and yes, the troops forcibly disarmed civilians. They kicked in doors and the whole nine yards. They weren't happy about it, but they did it all the same. They did wealthy and poor neighborhoods.
In the same turn, I wouldn't get into a battle with US troops or law enforcement under orders either.