High Quality Content by WIKIPEDIA articles! This is a list of U.S. Army weapons and material by supply catalog designation, or Standard Nomenclature List (SNL) by group. The U.S Army Ordnance Corps Supply Catalog used an alpha-numeric nomenclature system from about the mid-1920s to about 1958. These designations represent parts catalogs for supply and repair purposes. There can be numerous volumes, changes, and updates under each designation.