COLLEVILLE-SUR-MER, France—When the sun rises over Omaha Beach, revealing vast stretches of wet sand extending toward distant cliffs, one starts to grasp the immensity of the task faced by Allied soldiers on June 6, 1944, landing on the Nazi-occupied Normandy shore. Several ceremonies were being held Sunday to commemorate the 77th anniversary of D-Day, the decisive assault that led to the liberation of France and western Europe from Nazi control, and honor those who fell. “These are the men who enabled liberty to regain a foothold on the European continent, and who in the days and weeks that followed lifted the shackles of tyranny, hedgerow by Normandy hedgerow, mile by bloody mile,” Britain’s ambassador to France, Lord Edward Llewellyn, said at the inauguration of a new British monument to D-Day’s heroes. On D-Day, more than 150,000 Allied troops landed on the beaches code-named Omaha, Utah, Juno, Sword, and Gold, carried …