We collect and distribute millions of letters of thanks and support and send them directly to our active, reserve, and veteran military. The message of appreciation should stand alone.Be brief, warm, and sincere. Both the Phoenix and Tucson Offices are open for walk-in services Monday through Friday (except Holidays) from 8 am to 4 pm. Office of the Secretary of State Donors need to be appreciated too. If you want some guidance, check out our donor thank you letter templates for any organization! Operation Gratitude sends thousands of handwritten letters of appreciation, love and support to military and frontline responders. This article explores the value of sending gratitude messages and introduces guidance and templates for writing them. Following are some of the more commonly reported violations.