Unbecoming conduct (criminal or immoral activity), AWOL, poor service record, basically anything that is deemed to put the military in a bad light could be grounds for a dishonorable discharge. In cases of criminal conduct you could be subject to military courtmartial if committed on post or while engaged in military activity. You would then be sentenced to military prison, and after serving time would be dishonorably discharged.
A Dishonorable Discharge is the the worst fate conceivable.
It was formerly known as a "Bad Conduct Discharge" and ranks just above a Dishonorable Discharge.
am I considered a veteran if I have a dishonorable discharge
no
Walt Disney did not receive a dishonorable discharge because he never served in the military.
Yes.
Denaturalization is rare but possible. Some grounds for loses U.S. citizenship are lying about name and identity, aliases previously used, or criminal past; subversive organization membership; and dishonorable discharge from the military.
No, he got a medical discharge
The only thing you can do is appeal your discharge.
No.
Dishonorable discharge
Trust me, it is not public record.