At 20 years old, James Dunning volunteered for the new special force that would become the Commandos (or British Commandos). The Commandos quickly became famous for their rigorous training, elite status, and their green berets. 

Dunning fought with the Commandos during World War Two, most notably during the Dieppe Raid. Known as Operation Jubilee, the Dieppe Raid was an amphibious landing on the shores of Dieppe, France on August 19th, 1942. It was considered a failure due to the loss of almost 75% of their troops, but it gave the British valuable knowledge and experience that would contribute to the success of the D-Day Invasion.

After Dieppe, Dunning trained to become an officer. He was sent to Achnacarry Castle in the Scottish Highlands, which served as a training ground primarily for the Commandos. He went on to become an instructor there. 

Dunning later published a book about his experiences called The Fighting Fourth.

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