Can they extend him for non-judicial punishment because of his contractual end date?

If he was being involuntarily separated, then this is not an extension beyond his ETS. So the short answer is they can extend him beyond 1 April...

Can i still pursue a job in law enforcement?

Respectfully you have asked the same question three different ways. Be honest on the application and let the chips fall where they may. You may...

Do i have to disclose i was on the millitary for a police application ?

Yes as per my previous answer to your question.

If I got kicked from military for not showing up to drills do I have to put that on my police application

You have to answer each question truthfully so yes you would have to include this information.

Any case like this is going to be very fact specific. Compile your records and a time line of events and set up a consultation with a civil rights...

What do I do now?

No harm, no foul. Thankfully you weren't hurt.

Is this relationship illegal?

There could be multiple issues, including contributing to the delinquency of a minor.

What can I do?

I don't think the proper question is how can they, since they already did. The proper question is how do you defend yourself, and the answer to...

Do I need an attorney or can I just have a letter signed by me and notarized? How much could this cost me?

While you are not required to have a lawyer, you have substantial assets, and some complicated issues. Best way to make sure it is done right is to...

How do you suggest dealing with an angry co-worker?

You can complain to HR and/or look for another job.