During World War Two, a Japanese American battalion became one of the most decorated army units in US military history.

The 442nd Regimental Combat Unit earned more than 4,000 Purple Hearts and seven Presidential Unit Citations for extraordinary heroism in battle.

The unit was set up in 1943, just over a year after Japan bombed the US naval base at Pearl Harbor. Following the attack, 120,000 Japanese Americans living on the west coast were sent to internment camps, but many were keen to show their loyalty to the US.

They volunteered to join the 442nd RCT and fight in Europe. Hundreds of recruits came from the camps, while thousands of others were from the Japanese American community in Hawaii.

Among them was 19-year-old Matsuichi Kusatsu. His son Clyde tells Jane Wilkinson about how the unit fought prejudice to prove their loyalty, and a warning, this story includes racist language of the time.

Actor Clyde stars in the BBC World Service drama Purple Heart Warriors. To hear this six-part season search for Dramas, wherever you get your BBC podcasts.

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(Photo: Matsuichi Kusatsu in 1944. Credit: Family photo)