In this context the story of Hugh Thompson [1] is very interesting - a clear cut “kill the civilians“ order and people risking their careers and lives to disobey and protect the village.

Whats relevant though is that most soldiers obeyed the orders and preferred to commit war crimes. Even in the US military which has a strong moral ethos (or likes to portray itself that way which for the common soldier is the same thing) But what about all the other, smaller countries?

[1]https://en.m.wikipedia.org/wiki/Hugh_Thompson_Jr.