As for whether it was a civil or military flight (question from atakacs), most nations treat the operation of aircraft designed for military purposes as being military in nature, regardless of the status of the crew, because the aircraft are not designed or built to the standards that would apply to a civilian aircraft. It would be for Spain to decide on publication of the investigation report for a military accident that happened on its turf, not Airbus.
The impressive safety record of modern aircraft is due to the incorporation of countless lessons learned from previous aircraft accidents.
To put it quite bluntly, if they never release the cause of this A400M accident, and
any other aircraft crashes due to a similar problem, those responsible for not releasing the accident cause are guilty of murder.