Online file available as two tables in the Access to Archival Databases tool. The main table is the Army Serial Number Enlistment Card Records table that has records for almost 9 million men and women who enlisted in the Army and Women's Army Auxiliary Corps. The Army Serial Number Reserve Corps Statistical Card Records table has records for approximately 300,000 reservists in the Enlisted Reserve Corps.
The index contains over 49,000 names that were included in pension applications submitted to the Board of Pension Commissioners. The records were later transferred to the Archives after the last pension was paid in the 1950's. More than 18,000 applications were microfilmed and are available to researchers at the Archives Library.