I'm not in the military (nor I think I'll ever be) but my father and relatives were in the army. It's a rule in South Korea that all males born in South Korea must take part of the army. Even if they are a US residence, they were born there.
Just to point out. ^_^
Noiz [DRAMAtical Murder] 70%
Okita Souji [Hakuouki] 90%
Riku [Kingdom Hearts II] 70%
Yusei Fudo [Yu-Gi-Oh! 5Ds]
Chrome Dokuro [Katekyo Hitman REBORN!]
Armin Arlet or Levi [Shingeki no Kyojin]