Both possibilities involve leaving your job; however, there are some benefits you're entitled to get when you retire instead of resigning. A resignation implies future activity.Friends, colleagues, and students will want to know what is next for me. Include the position title and the last day you intend to work. 2-4 Weeks Before Retirement. This letter should specify your last day of work. Your department will forward a copy to the Human Resources Department for placement in your personnel file. (800)638-5000. 45 days out complete an End of Employment (Exit Interview) with your commanding officer, as well as the Ethics. If you plan to resign or retire from the university, please submit a resignation letter to your manager. Tailor your letter to your unique experience on the job and offer details that feel appropriate for your situation.