High Quality Content by WIKIPEDIA articles! Operation Taxable was the codename for one of the deception operations used by the Allied forces during World War II in connection with the Normandy landings (Operation Overlord). This in conjunction with Operation Glimmer, was conducted by aircraft of the Royal Air Force to create a fake threat to induce the Germans to believe that the main invasion of France would occur in the Pas de Calais rather than Normandy.