The Obvious Question is Why?

SEE HERE Military weapons are being stolen.  The obvious questions to ask is: 1) Does this represent an increase or are they being stolen at about the same pace as in the past? and 2) Where are they going and what is their intended use?  Artillery shells are an example of a pretty big hunk of explosive and will make quite a hole it detonated.  Fully automatic weapons are also fairly heavy firepower, although I'm from the "make every shot count" club.  Why waste ammunition?  So should we be concerned and if so how much?