

One type of card, the General Index Card listed the soldier's name, the soldier's rank at the time of enlistment from the first card and the date the soldier left the service with the soldier's final rank from the last card. When Ainsworth's staff finished the Compiled Military Service records, each soldier's file usually had many cards representing each time the soldier's name appeared on a muster roll. His staff wrote a card for every time a soldier's name appeared on a muster roll. Beginning in the 1880s General Ainsworth's staff in the Department of the Army indexed these records originally to determine who was eligible for a pension. During the American Civil War, every few weeks to every few months depending on the unit, usually at the company level, soldiers' names were recorded on muster rolls.
