The Second World War reduced Gillette's blade production both domestically and internationally. As a result of the war, many markets were closed off, German and Japanese forces expropriated the company's plants and property, and Gillette's plants in Boston and London were partially converted for weapons production. In 1942 the War Production Board ordered Gillette to dedicate its entire razor production and most blade production to the U.S. military. By the end of the war, servicemen had been issued 12.5 million razors and 1.5 billion blades. Gillette also assisted the U.S. Army in military intelligence by producing copies of German razor blades for secret agents venturing behind German lines so that their identities wouldn't be compromised by their shaving equipment. The company also manufactured razors that concealed money and escape maps in their handles, and magnetic double-edge blades that prisoners of war could use as a compass.