U.S. Secretary of defense Robert S. McNamara (center) inspects the new German standard tank which might become NATO equipment. The tank crew here demonstrates diving capability of the tank with snorkel-like tower seen above water. Center right is the commander of the German tank corps, Brig. Gen. Reidel; standing next West German Defense Minister Kai- Uwe Von Hassel August 1, 1963 in Munster. (AP Photo)