Each Memorial Day, Americans proudly, and solemnly, display our flags only at the half-staff position for the morning, not to return them to the full-staff position until noon. This we do in memory of the million-some casualties whom our nation has lost in battle since the Founding era. We hold parades in their honor; we hoist a flag and raise a toast at city parks and private barbecues. We may wear red, white and blue clothing, or flag lapel pins, or decorate our homes with bunting. But for all this show of support, who are we really honoring? Do we...