Societies, cultures, and nations all have the moral right to protect themselves. I wish I were young enough to join the military for a shorter or longer duration to acquit myself of the responsiblity to serve.
Jehovah's Witnesses of course will not serve, but they certainly do not hesitate to take advantage of the freedom and security in this country that has been purchased for them via the supreme sacrifice having been made by so many.
In further answering your question, I personally feel it is immoral not to serve - unspeakable not to serve and then to heap scorn on the very military that guarantees you the right to heap scorn in the first place.
Jesus Christ how I do despise the cult of JWs.
francois