DO NOT GO. Most people think if you don't talk to the police it will be bad. If you talk to the police it will not get better and will likely get worse. You have the right to remain silent. Use it. Since the charges are misdemeanor charges more likely than not they will file the charges and mail you a summons to court.
DO NOT GO and remain silent. If they didn't want to file charges they wouldn't want to speak to you.
Your fact scenario is missing some parts so here is some general information on the ARD process. Prior to placement on ARD the DA can withdraw their recommendation if they have just cause. Just cause can be receiving a new charge. If this person was actually placed on ARD after they were arrested for simple assault then the person could not be removed from ARD because the arrest happened prior to being placed.
The person should contact their lawyer to get clarity on their situation. If...
Preselection generally means you look like a good candidate for ARD. Generally speaking you must fill out the DA's application and go through the formal process. Some counties require an upfront fee to apply. Most all counties have payment plans for ARD.
You must contact a lawyer who regularly handles ARD case in your county. Furthermore, you should contact a lawyer who will look at your case to see of you have a defense to the charges and not a lwayer who only runs you through the process.
By statute your juvenile adjudications can't be expunged. However, I have seen some instances where the DA agreed to an expungment and the judge let it happen. You need to contact a lawyer familiar with your DA and court practices.
As for elligibility to get into the Army. Only the Army recruiter can answer that question.
In State College, PA the police will pull you over for the smallest of traffic infractions because they are actively looking for DUI cases. Even if you do well on the field sobriety tests if the portable breathalyzer is close to or over .08 you will be arrested and taken for a blood test.
The portable breath test can't be used against you in court and the blood test that is done at Mount Nittany Medical Center is fraught with all kinds of legal and technical issues so a blood test reading...
Please disregard the prior answer from the gentleman from California as he is incorrect. ARD are for first offender DUI cases as well as all other types of criminal charges. There isn't a limit on what types of charges or how many ARD dispositions you can get on non-DUI offenses.
ARD dispositions are at the discretion of the DA. Whether the DA will grant you an ARD is dependant upon a lot of factors including but not limited to the facts of the case, your prior record, victim input and on...
Another reason there are few DUI trials is that there are few lawyers who have the proper training as to the science behind the test done on their blood, breath testing, and field sobriety testing.
When choosing a lawyer to represent you for your DUI you want to ask them how often they go to trial, do they have DUI specific training, do they belong to scientific organizations relevant to DUI defense.
These are important questions to ask a lawyer if you intend to fight your case.