<prompt> Translate the following text to EnglishMkurugenzi wa Tume ya Kiwango cha Posta PRC ni shirika huru la serikali ya Marekani, tofauti na Huduma ya Posta ya Marekani.  <response>: The author is Special Assistant to the Postal Rate Commission, an independent U. S. Government Agency, separate from the United States Postal Service. 