Members of Seri Thai, an anti-Japanese resistance group from Thailand, in Chicago during the 1940s. These men were given training by the American OSS (precursor to the CIA) and intended for top secret work against the Japanese and the Axis Thai military.

Thai OSS Agents

A good example of the hypocrisy in condemning the Japanese as "brutal".
Here, the severed head of a Japanese soldier is put on display by Allied troops. US soldiers in particular were known for their desecration of Japanese war dead. 

It is interesting how everyone is so quick to judge the Japanese, yet fail to look at the actions of soldiers from their own country during the Pacific war...

Allied Brutality

Irish soldiers who volunteered to fight for the British during WW2. 
Considered deserters and traitors by many at home, these men risked their lives fighting in the western theater, and from all accounts proved to be very able soldiers.