I need to correct myself here ....
U.S. Marines WERE , of course , deployed in WW1
I was somehow thinking of the vast war graves in Normandy
from WW2 .
I apologize
Excerpts from Wiki on this:
United States forces suffered 9,777 casualties, included 1,811 killed.[1]:32 Many are buried in the nearby Aisne-Marne American Cemetery.
"After the battle, the French renamed the wood "Bois de la Brigade de Marine" ("Wood of the Marine Brigade") in honor of the Marines' tenacity. The French government also later awarded the 5th and 6th Marine Regiments the Croix de guerre. An official German report classified the Marines as "vigorous, self-confident, and remarkable marksmen ..." General Pershing—commander of the AEF—said, "The deadliest weapon in the world is a United States Marine and his rifle." Pershing also said "the Battle of Belleau Wood was for the U.S. the biggest battle since Appomattox and the most considerable engagement American troops had ever had with a foreign enemy."