Ah, Good

I did not know this. 

The Defense Authorization Bill for fiscal year 2011.  It prevents the military from forcing off-base residing military personnel from registering their firearms with on-base authorities.

Some base commanders got the idea that if they required registration somehow that would prevent a repeat of what happened with that Nidal guy shooting folks at Ft Hood.  I have no idea how that thought process occurred to them and they thought it would be effective, except as an extension of their instinctive reaction to take charge and command and appear to do something after a catastrophic failure.  High ranking .mil folks are human I guess.