Can army medical board keep you past ets date?

Yes. A meb will hold you past your ets date if you so choose to go through with a meb and not get out on your ets date. Your peblo will direct you to your battalion and have your enlistment office enter an extension code on your erb about 12 months past the date you started your meb. It will keep you active duty until the meb is complete. If the meb completes befor the date set on your erb thin you will not be held to the date of your erb only until the completion of the meb. Hope this helped you.