special mail services such as registry and insurance are available. One  daily  question  asked  by  postal  patrons  that will never go away is, “How long will it take for this letter to get there?” If  you  are  familiar  with  the  USPS  service commitments (ZIP Code mail only), then this question is not as impossible to answer as you may think.  Table 1-1 (USPS service commitments) shows the class of mail and the time it normally takes for the USPS to make  delivery.     These  service  standards  are  for continental  United  States  (CONUS)  delivery; however, if you are at an overseas MPO, just add on the time  it  takes  for  the  letter  mail  dispatch  to  transit through military control and arrive at the gateway. You may not be able to give an exact delivery day, but you should be very close.  The USPS evaluates its service commitments very closely and publishes them in the National  Five-Digit  ZIP  Code  and  Post  Office Directory (Publication 65-A). You  can  improve  service  by  advising  your customers of the following:    Inform  correspondents  and  publishers  of  their correct  mailing  addresses  to  include  delivery receptacle numbers, as applicable.    Submit  change  of  address  cards  immediately when a new address is known.    Notify the responsible mail clerk or mail orderly when departing on leave or temporary duty.    Report to the postal officer, mail clerk, or mail orderly  any  instance  when  inadequate  mail service or other mail-related problems are noted. CUSTOMER SERVICE You should strive to give your postal customers the best  service  possible,  not  only  in  the  dispatch  and delivery  of  their  mail  but  also  in  window  business transactions.    You  should  consider  it  a  privilege  to serve the public and to make an all-out effort to help customers  in  any  way  possible.   As  a  window  clerk, you   should   always   be   courteous,   efficient, knowledgeable in your job, and give excellent service day in and day out.  As a window clerk, here are some of the guidelines you should follow:    Provide  a  neat  and  clean  counter  on  which  to transact business    Present  a  well-groomed  and  neat  personal appearance    Give a friendly greeting that expresses a desire to help 1-4 Mail Class Express Mail Priority Mail First-Class Mail Periodicals Standard Mail (B) Standard Mail (A) Over- night 2nd Day 3rd Day 4th Day 5th Day 6th Day 7th Day 8th Day 9th Day 10th Day Notes Directories available at your local post offices. Primarily a two-day product. 11 ounces or less. Surface preferential See local BMC Manager for Parcel Post Commitments. Mail entered at the Destination P&DC has a 2&3 day commitment. For additional information contact the MANAGER,   SERVICE POLICIES AND PROGRAMS, POSTAL HEADQUARTERS, 475 L'ENFANT PLAZA SW,   WASHINGTON DC 20260-2806. UNITED STATES POSTAL SERVICE Service Commitments (ZIP Coded mail only) C PCt0101 Table 1-1.—USPS Service Commitments.