World War I
from the exhibit, "The Price of Freedom: Americans at War" at the National Museum of American History, Smithsonian Institution, Washington, DC

On Memorial Day (U.S.) let us honor all those who have died in service to their country.

American War Dead:
Iraq War--1,656 (as of 5/30/05)
Afghan War--184 (as of 5/16/05)
Persian Gulf War--382
Vietnam War--58,200
Korean War--36,574
World War II--405,399
World War I--116,516
Spanish-American War--2,446
Civil War--364,511 (Union), 133,821 (Confederate, estimate)
Mexican War--13,283
War of 1812--2,260
Revolutionary War--4,435

Total--1,139,667

(Source CNN.com from Department of Defense, Department of Veterans Affairs)