'Poppy Memorial' at National Mall honors 645,000 war dead on Memorial Day weekend

The 645,000 poppies signify men and women who died in U.S. military service.

Each poppy flower symbolizes a life of a fallen service member and their sacrifice.

The abundance of poppies was inspired by the World War I poem, "In Flanders Field."

A portion of the poem reads, "In Flanders fields the poppies blow / Between the crosses, row on row, / That mark our place, and in the sky, / The larks, still bravely singing, fly, / Scarce heard amid the guns below. / We are the dead; short days ago / We lived, felt dawn, saw sunset glow, / Loved and were loved, and now we lie / In Flanders fields."