First pictures of Germany 's ''Secret Weapon'' Tanks in Libya -- The German ''Secret Weapon'' Tank, as it appeared to outward view - an ordinary mark German Tank. Germany it is now revealed, has been using ''Secret Weapon'' Tanks in the President Libyan campaign. The Tanks are, to the outward view, ordinary German mark I Tanks. Actually the armoured turrets have been out off and replaced by thin metal shields. Behind these heavy Calibre guns were mounted, giving a maximum range of about 5,000 yards and firing armour-piercing shells. May 20, 1942. (Photo by Associated Press Photo).