Designed by Swedish cryptographer Boris Hagelin, the M-209 Converter was a portable, mechanical cipher machine. Used extensively during WWII and the Korean conflict by both the Army Signal Corps and the U.S. Navy (which designated it the CSP-1500), Hagelin's device allowed a rapid and secure means of communication. The lunchbox- sized machine was so simple that little training was required to use it, yet its cipher scheme proved very difficult - but not impossible - for the Germans to crack. The M-209's elegant design uses six adjustable key wheels or rotors to produce a reciprocal...

The US 75-mm tank gun M2 was the standard American tank gun of the Second World War. The M2 originated from the famous French Canon de 75 modele 1897 field gun of World War I fame, which was also adopted by the United States and used well into World War II as the 75-mm M1897 field gun. The primary round fired by the M2 was the M48 High Explosive. This round traveled at 625m/s and contained 1.5 pounds of TNT filling. The M48 was available in two versions, standard or supercharge. Supercharge increased the propellent charge for greater muzzle velocity. Other important rounds fired by the 75-mm...