Federal government employees in Washington are quite familiar with the various travel vouchers that they have to fill out in order to receive reimbursement for official travel. 150 years ago, federal officers also had to complete standardized travel vouchers and reimbursement calculations. I ran across such a voucher, a U.S. Government form No. 16, while researching the records of the Army of the Potomac's Bureau of Military Information (BMI) at the National Archives.