Hi Barbara,Within the paragraph below is an address that you may be able to write to to obtain code list.Good luck.
Unit operational records are probably the best sources of information because they were created by unit members either during or shortly after the events that they chronicle. Official operational records created before 1940 can be found in the Military Reference Branch, National Archives and Records Administration, Washington, D.C.20408. World War II, Korean War, and Vietnam War unit records are in the custody of the Suitland Reference Branch, National Archives and Records Administration, Washington, D.C. 20409. Morning reports and rosters provide information on unit personnel strengths and are available to researchers. Unit morning reports and rosters created between 1917 and 1974 (the year morning reports were discontinued) are in the custody of the National Personnel Records Center, 9700 Page Boulevard, St. Louis, Mo.63132-5200. Rosters for Regular Army units created since 1974 are also located at the National Personnel Records Center, but Army Reserve rosters for the same period are in the custody of the Army Reserve Personnel Center, which is co-located with the National Personnel Records Center.