Ron, I don't have an exact answer for your question - but Kstate has answered for what accounts for the majority of problems. From what I have read, each death or shock is related to different areas and equipment being used over there - all related to improper grounding techniques. Here is another example. http://mssparky.com/2009/01/yet-another-kbr-electrical-shock-in-iraq/ 

Keeping in mine, pending legal action is ongoing, so maybe the exact reason will not be known untill after legal pendings are over? There's no reason this should be happening . . .