CID Investigating Missing Weapons from Stuttgart Arms Room

I have never heard of an military arms rooms getting broken into.  Considering the security that goes with an arms room I think this has to be an inside job by someone who had access to the arms room.  Has any ROK Heads ever heard of an arms room getting broken into?:

Special agents from the U.S. Army Criminal Investigation Command are investigating the theft of guns and other military equipment from a base arms room in Stuttgart, military officials said.

“Several semi-automatic pistols, one small-caliber automatic rifle and a shotgun were among the items taken,” said Chris Grey, a CID spokesman.

The Army did not identify all the items stolen or the unit targeted, citing the active investigation. A possible breach of the base fence is also part of the ongoing probe.

“We are looking at all possibilities as the investigation continues, but at this point in the investigation it does not appear that an outside entity stole the firearms and equipment or breached the fence line, but we have not completely ruled it out,” Grey said.  [Stars & Stripes]

I would think the first person to ask what happened would be the unit armorer who has the code to enter into the arms room.  For example did he give the code out to someone else that wasn’t authorized to open the arms room?