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In Short: Your character should be villainous because they have the qualities of a villain, not because the group they are from gives them villainous qualities. I think your real question is "how ...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/35651 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
In Short: Your character should be villainous because they have the qualities of a villain, not because the group they are from gives them villainous qualities. I think your real question is "how do I avoid offending people?" and the answer is by having hard conversations with the groups you might offend and if possible getting a reader from those groups to give your draft a once over. After all of that, you'll probably still offend _someone_. Generically, you want to construct people who feel real, with all human foibles, but you also want to get any pertinent details about the experience right and not fall into traps of cliche. The answer to your question is: research. There are going to be verteran communities on the internet somewhere. Should be a good place to start such research. I wouldn't get into everything you dumped on us in your paragraph. Just ask what life is like, what stereotypes to avoid, and what people get wrong in arts/literature/tv/movies about veterans. They'll be able to tell you. If you do get readers from the population you might be offending and they tell you you're doing an awful job, which is possible, then you're going to have to make the call if what you're writing is publishable. There are published, successful, award winning authors out there who have put a book on the shelf unpublished based on advice from such readers. You're right to ask, but not everyone is ready or has the background to approach such topics and give them the correct treatment. Given that you're an outsider, you may wish to rethink your strategy if you're unwilling to put in the additional time and respect the answers you are given. Then again, maybe amputees and veterans will love your story and not have a problem or you'll be able to work with them to tell a better story than you might otherwise have done so.