ilovemydog as I understand it, the law on this exact issue has recently been changed so that the US military do not have to prove any damage was done. So, GM could not have defended himself. His guilt was assumed on the "damage" charge, regardless of whether he caused any damage or not
This goes right againt the UK principal of "innocent until proven guilty" that yes, many people in this country felt uncomfortable about the justice that he would face in the US.
I for one am very happy at the decision and rather surprised that I agreed with a Tory