The Americans controlled West Germany........West Berlin...........and most of Japan after WW2..........the Soviets East Germany.........East Berlin................the whole of Eastern Europe and Japan's northern most island....................rocketry............computer science........coding..........human experiments..............those were the reasons.......

Japanese Biological Warfare Atrocities - world future fund

www.worldfuturefund.org/wffmaster/.../war.../Jap%20Bio-Warfare.htm

JAPANESE BIO-WEAPONS RESEARCH, MEDICAL EXPERIMENTS, AND UNIT ....to the public of all records from the Empire of Japan that are held at NARA.

Japan's Secret Weapons of World War II - Tofugu

www.tofugu.com/2012/09/29/japans-secret-weapons-of-world-war-ii/

Sep 29, 2012 - And then there was Project Z. Project Z (also called the Z Bombers Project) was a military project of the Empire of Japan, similar to the Nazi  ..