Memorial Day is a United States federal holiday observed on the last Monday of May. Formerly known as Decoration Day, it commemorates U.S. men and women who died while in the military service. First enacted to honor Union soldiers of the American Civil War (it is celebrated near the day of reunification after the civil war), it was expanded after World War I to include American casualties of any war or military action. [source][More on the history of Memorial Day]
Unnamed Remains the Bravest Soldier - by Walt Whitman (From 'Specimen Days')
OF scenes like these, I say, who writes—whoe’er can write the story? Of many a score—aye, thousands, north and south, of unwrit heroes, unknown heroisms, incredible, impromptu, first-class desperations—who tells? No history ever—no poem sings, no music sounds, those bravest men of all—those deeds. No formal general’s report, nor book in the library, nor column in the paper, embalms the bravest, north or south, east or west. Unnamed, unknown, remain, and still remain, the bravest soldiers. Our manliest—our boys—our hardy darlings; no picture gives them. Likely, the typic one of them (standing, no doubt, for hundreds, thousands,) crawls aside to some bush-clump, or ferny tuft, on receiving his death-shot—there sheltering a little while, soaking roots, grass and soil, with red blood—the battle advances, retreats, flits from the scene, sweeps by—and there, haply with pain and suffering (yet less, far less, than is supposed,) the last lethargy winds like a serpent round him—the eyes glaze in death—none recks—perhaps the burial-squads, in truce, a week afterwards, search not the secluded spot—and there, at last, the Bravest Soldier crumbles in mother earth, unburied and unknown.
The cartoon above is by John T. McCutcheon - published circa 1900