I clarified my statement in a follow-up post. The uniform a person wears does not necessarily indicate their moral character. Many soldiers have no choice and are drafted/conscripted. The Nazi army conscripted men from ages 16-60 by the end of the war. Boys aged 12 and under were manning artillery units. I don't believe that they were all evil.
So no, I don't think it's "okay" to say all soldiers forced to fight on the side of an evil regime are evil. War may sometimes be necessary but I don't think it is ever good in the real world.