Executive Order 5605—Actual Expenses and Per Diem Allowances for Civilian Officers and Employees While Traveling
Executive Order No. 5014, issued December 19, 1928, prescribing regulations for the allowance and payment of actual expenses and the fixing and payment of per diem allowances for civilian officers and employees while traveling on official business and away from their designated posts of duty, is hereby revoked, effective July 1, 1931. These regulations, with amendments, are prescribed in the amended edition of the Standardized Government Travel Regulations, approved by the President April 21, 1931, to become effective July 1, 1931.
The White House,
April 21, 1931.
Herbert Hoover, Executive Order 5605—Actual Expenses and Per Diem Allowances for Civilian Officers and Employees While Traveling Online by Gerhard Peters and John T. Woolley, The American Presidency Project https://www.presidency.ucsb.edu/node/361217