A search will get underway in the months ahead at Archbold, after superintendent Aaron Rex submitted his letter of resignation to the board at a special meeting Wednesday night.   Rex is stepping down after over 5 years leading the district, and is headed to Wapakoneta City Schools, where he will be superintendent there.             The Archbold School Board has decided they will hire an interim superintendent in the short term, to carry them through the coming school year.   But they will take the next year to complete a search for a permanent superintendent of the district.    Rex will be staying on through the end of July.