Which country's military first scientifically developed disruptive pattern camouflage uniforms (using irregular shapes rather than solid colors) based on research by a zoologist?

The development of camouflage patterns represents one of military history's most fascinating intersections of science, art, and tactical necessity. What began as simple earth-toned uniforms evolved into sophisticated design systems backed by extensive research. This poll tests your knowledge about a pivotal moment in military product design history that changed how armies approached concealment and influenced countless civilian products thereafter. Can you identify the breakthrough innovation that revolutionized battlefield concealment?

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United States (1942 'frog skin' pattern)
United Kingdom (1942 Denison Smock design)
Germany (1937 Waffen-SS splinter pattern)
Soviet Union (1944 'Amoeba' pattern)