A subscription database available from Ancestry.com:
This database contains returns from U.S. military posts from the early 1800's to 1916, with a few returns extending through 1917.
Army Regulations stipulated that every post was to submit a return to the Adjutant General, usually at monthly intervals. These returns showed:
• The units stationed at each post
• The strength of each unit
• Names and duties of the officers
• Number of officers present and absent
• Listing of official communications received
• Record of events
This information was returned on forms provided by the Office of the Adjutant General. Over the years, several changes were made to the forms, but the general information recorded was the same. In the earlier years some returns were sent on manuscript forms. These manuscript forms followed the format of the printed forms. Earlier post returns also used the same forms as the regimental and organizational returns.
While most of the records in this collection consist of monthly post returns, some additional records, such as morning reports, field returns, rosters of officers, and other related papers, have been mixed in. These additional records provide supplemental information or act as substitutes for missing returns. Records are available for military posts in all 50 states, Washington D.C., Cuba, Panama Canal Zone, Philippine Islands, Puerto Rico, Canada, China, and Mexico.