I have a theory, by observations, that those immigrants to U.S. who consider U.S. as a reward or upgrade to their military service, have zero quality from their army training. Should they display any disciplinary virtue, it is due to a passive effect or interest from other area.
Of course, it needs not be said of those who immigrate for the purpose of escaping military duty. Although, I must add, that the main problem with these are more in the area of respect and responsibility than discipline. It is therefore a more serious problem.
Mandatory military service (provided it is within justified ethical code) required in countries such as Taiwan or South Korea serves a neutral function, I believe. Therefore it is not to escape from nor is it necessary for all nations in the world. It is a blessing for those who seek it in discipline and a rebuke to those who run away from it. As for running away, those who run away after completion of military service as a reward are in many ways better than those who immigrated before they begun it.
As for those who are not demanded such disciplinary service, including those who were moved away from it without themselves being aware of such, it is insufficient for me to evaluate.
Last but not least, there are those rare ones who after military service, immigrated, or moved abroad, to seek higher challenge, even temporarily, that should they keep it up and slack not in the end, they have greatness awaiting ahead.