Mark W said:
			
		
	
	
 
That isn't completely true.  I guarantee if you stood on public ground just outside of Redstone Arsenal and started taking pictures or flying drones you would quickly be arrested.  My point is there are probably some situations where it is legal, and others where it isn't.  Probably in this case you are correct that they don't need permission, but there are certainly times where you can't.  I don't know where the line is.    
 
It's no wonder there's no shortage of people going to court.  A lot of laws on the books and no end to people who disagree and can't work it out.  Been there myself.     
 
Eric    
 
p.s.  I suspect there is probably a whole other side to this too.  Audio and video I bet are different under the law.