Today in World War II History—July 28, 1940 & 1945

Wreckage of the B-25 that crashed into the Empire State Building, 28 Jul 1945 (Acme Newspictures, public domain via Wikipedia)
80 Years Ago—July 28, 1940: Road and rail links between Vichy France and Nazi-occupied France are severed.

Stalin, Attlee, Truman, and others at the Potsdam Conference, Germany, 28 Jul 1945 (German Federal Archive, Bild 183-R67561)
75 Years Ago—July 28, 1945: Japanese “choose to ignore” Allied Potsdam Declaration requiring unconditional surrender.
Destroyer USS Callaghan becomes the last Allied ship to be sunk by a kamikaze.
US Senate ratifies United Nations Charter.
A B-25 Mitchell medium bomber crashes into the Empire State Building at the 79th floor in the fog; 19 are killed.