America's "Tiger Tanks".
During the Korean Conflict some American tanks were painted with tiger faces and claws on them. This was a type of psychological warfare, playing on the superstitions of the Chinese soldiers that were aiding the North Koreans.
It was used during the Lunar Calendar of 1950 - 51 which was ironically, the year of the tiger. There is no evidence whether this tactic actually worked or not. I would not want my tank painted like that. Nothing is better than a bright yellow target to shoot at. However, it does look cool.
Below are two examples: The M4A3E8 Sherman and the M26 Pershing which would later be upgraded and renamed the M46 Patton.


M4A3E8 Sherman

M26 Pershing