This worries me. It overturns the notion that arms useful for military service are protected."
Not so at all: this merely says that Miller ONLY addresses the issue of what kinds of weapons are "militia weapons", useful for military service, and that it does NOT require actual service in the militia to qualify to bear them.
Be very careful not to read this decision selectively.
"4 justices can not understand The Constitution, it'. Its simple."
On a rant about the SC taking away our rights of all kinds.