These men were on the cusp of history, part of a massive convergence of land, air, and sea forces of the allied armies. When this June 6, 1944 photo was taken, Gen. Dwight D. Eisenhower, Allied Commander in Chief, was speaking with American paratroopers at an undisclosed location in England, prior to plans to participate in the first assault on the coast of France during D-Day. (U.S. Army Signal Corps Photo via AP, File)