https://www.gao.gov/products/442955

B-45106: Sep 23, 1948

APPROVAL OF THE SYMBOL "S" TO DESIGNATE CONTRACTS OF SALE EXECUTED BY THE AIR MATERIEL COMMAND IS HEREBY GIVEN. IT IS UNDERSTOOD THAT A SEPARATE SERIES OF SERIAL NUMBERS WILL BE USED FOR NUMBERING CONTRACTS OF SALE...

https://www.gao.gov/products/455271

B-45106: Aug 23, 1948

AS FOLLOWS: "THE DEPARTMENT OF THE AIR FORCE DESIRES YOUR APPROVAL OF A SYSTEM OF NUMBERING CONTRACTS WHICH WILL PROVIDE FOR A COMPLETE CENTRAL CONTROL OF CONTRACTS IN SUCH A WAY AS TO MAKE THEM READILY IDENTIFIABLE AS DEPARTMENT OF THE AIR FORCE. "A TYPICAL EXAMPLE OF THE GENERAL SCHEME OF NUMBERING IS ILLUSTRATED BELOW: AF 33-038-1 THE 'AF' REPRESENTS THE DEPARTMENT OF THE AIR FORCE. THE '33' RE...