Before he was in the United Forces, Geun-Tae was son to a noble family from the Fire Nation. Youngest heir to the family title, he was expected to make his name elsewhere. At a young age he enlisted in the Fire Nation navy, training with similar aged boys to become a soldier. They taught him dedication, strength, more so --to be ferocious. Ten years passed, and who once was a cadet moved up to a ranking officer.
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At twenty years old, Geun finally became privy to the traditions of the fire nation, and how their soldiers treated those that were different. Despite there being 'peace' in the world, the fire nation still held a grudge against everyone that was different. This was a world that he wanted no part in being, --and the Avatar's United Nations paved the way for his escape.
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Saying goodbye to his family, Geun-Tae swore allegiance to the United Republic and was enlisted as an officer in the United forces. Here he met a diverse group of individuals, some of which would be his allies forever. Time improved his standings and he was bestowed with the honor of commanding the first division of the United Forces.

+firebending: expert[break]
+swordsmanship: adept[break]

-a sharp military grade cutlass[break]