NoD,
Military airfoil and structures are indeed different from that of a civilian type.
I really have not the foggiest on what caused this accident however, should there have been a principal construction flaw I’d expect to have heard of other such incidents before. The A300 is a machine which has been introduced as the first Airbus PAX aircraft in 1974, and has an excellent construction record so far.
Early reports have indicated that the aircraft experienced a tail strike some time back, I wonder if that may have had anything to do with this accident.