I have read scores of the stories of German "soldiers." Nearly every one will end claiming that they never knew and were just shocked to find out what happened to the Jews at the end of the war. I don't believe it, never have and never will. There is no way to keep a secret that big. They knew.
Just growing up in the Nazi society they saw how Jews were treated and saw the progression of mistreatment. The ones who fought through Ukraine knew that the Jews had not been relocated there.... When you empty cities of a population, load them up like animals packed into freight cars and ship them away, never to be seen again, it is not too damn hard to figure out what was happening. Those who didn't know, just didn't want to know.
The other common tread of German "soldiers," including some in the SS, is that they were never Nazis, they never liked Hitler and that they were all choirboys. Over the last 60 years I read the stories of the soldiers on all sides of WWII, I have read those stories to find out what went on on the battlefield, I have spent a lifetime trying to figure out how people can be so cruel to other people. (I am no closer than when I began) So, no, the German soldier's stories have no place in the classroom because the stories are all based upon lies or based on something that they claim they knew nothing about...
If you want a real honest perspective of what the holocausts looked like from soldiers, take the words of the Americans who liberated the camps. They were sickened, horrified and outraged. When they saw the camps they realized what they, and their comrades, had sacrificed their youth for.