I think stating that they're already under Martial Law is jumping the gun, by a very, very wide margin.
The City Council made a decision.
Tell me what city wouldn't make this decision - you have a city that also is home to a military installation. In some sort of emergency (example, Katrina, Sandy, etc), you, as the City Council members decide that maybe, just maybe, that in-city military installation just might be better at handling this situation that your city police, firefighters, volunteers...
That's the decision that the City Council in Tucson came up with.
Pass that on to your sister, man...