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I have been wondering the same thing. It seems like I remember the National Guard being called out by the governor (after hurricanes for instance), yet it seems I remember George W. Bush threatening the governor of Louisiana with calling out the National Guard before/after Hurricane Katrina if she didn't begin preparations. There were Guard members at the Orlando International Airport after 9/11. Wikipedia says of the Florida National Guard:

“The United States Constitution charges the National Guard with dual federal and state missions. Ordinarily under the control of the state government (in which the governor is the commander-in-chief) pursuant to Title 32 of the United States Code, National Guard troops may also be called into active federal service with the United States Army or the United States Air Force (in which the president serves as commander-in-chief) and deployed world-wide with their active duty Army and Air Force counterparts.

The Florida National Guard, like those of other states, provides trained and equipped units for prompt mobilization in case of war or national emergency. Guardsmen may take part in functions ranging from limited actions in non-emergency situations to full-scale law enforcement (martial law) in cases when the governor determines that ordinary law enforcement officials can no longer maintain civil control. The state mission assigned to the National Guard is ‘to provide trained and disciplined forces for domestic emergencies or as otherwise provided by state law.’

The Florida National Guard serves as the state's ‘defense force.’”