If memory serves, Thales were flying the one that crashed in icing conditions under a military flight test permit which had been issued earlier that year. Whilst the the SI was (rightly) critical of the choices made such as flying the sortie with a rather expensive and limited-availability radar on board, the officers singularly missed the obvious point i.e. you don't deliberately fly an unmanned system into icing conditions, even more so in a system designed such that the Remote Pilots have no means of 'direct' control.