He was comparing US soldiers to Nazis.
Given the circumstances from the two articles I've read on this, he could most certainly have been called a coward and a disgrace in his discharge.
It's what he is and always will be.
No way to excuse that.
Any man that has served as SAS is no coward, the training process isn't just physically and mentally tough it is dangerous, to complete it means he has endured many challenges of courage. Before he made it into the SAS he served as a British paratrooper, another unit that to serve in, proves courage. He has served as one of the worlds best Special Forces troops in Afghanistan and Iraq, I assume he is wrong, and you can think him a disgrace, but the man is no coward.