[Zhang Fei]

But if these guys served honorably, they would have been able to become citizens.

Green card holders don't have to join the military to become citizens - they just have to have been resident in the country for 5 years. Are you sure that a veteran's naturalization application requires an honorable discharge?

[Tennessee Nana]

Are you sure that a veteran’s naturalization application requires an honorable discharge?
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Well it is proof the applicant is fit to be a citizen...

But just serving honorably will be accepted so the serviceman can be naturalized while he or she is still in the military..

and not committing crimes always helps..

to get a green card the immigrant had to have a clean record in the first place...

and that makes them eligible to join the military etc also...