The military is often an option for ex-offenders looking for jobs. Once your probation is finished, I suggest you speak to a recruiter. Even if your charged is expunged, it will still be visible to the military. It will always be visible to the court system, law enforcement and any government agency. The recruiter will be able to help you establish your eligibility. I don't know which branch of the military you are interested in but the Army has a record of being more lenient than the others.
I hope this helps.