My feelings on this are mixed, as are many peoples it seems.
There is a lot more to this than much of the British public are aware of - namely, the amount of ammunition and the possible culture of this activity associated with a few more individuals within that unit of the Regiment. Many on the 'outrage bus' are on it because of the way the media has portrayed the bloke; an innocent war hero (can't argue with that last bit) who has been wrongfully indicted with illegal possession of a firearm etc etc. So, he was in possession of a firearm and nearly 300 rds of ammo which, in THIS country of ours, IS illegal.
Mitigating circumstances, reduction of harsh initial sentences etc have all played their part but the bottom line is that Sgt Nightingale committed a crime, now has a criminal record and won't ever escape that. I hope he learned whatever lessons came out of this episode of his life and can now move on with his family and friends behind him.
I don't necessarily wish him luck but I do wish him better judgement in future...