August 06, 1898
Ordered , That the graves of our soldiers at Santiago shall be permanently marked. The present marking will last but a short time, and before its effacement occurs suitable and permanent markers should be put up.
The Secretary of War is charged with the execution of this order.
WILLIAM MCKINLEY
William McKinley, Executive Order Online by Gerhard Peters and John T. Woolley, The American Presidency Project https://www.presidency.ucsb.edu/node/205886