Until this year, Korea prohibited people of mixed race, like my children (who are half-Korean and half-white), from enrolling in their military. Now, largely a result of Hines Ward, a mixed race Korean-American becoming MVP for the Steelers in the U.S. Superbowl, the Korean military has finally decided that maybe this policy was a bad idea, and have ended the ban, although mixed race Koreans are still not subject to the draft in South Korea. I'm no football fan, but I'm offering Mr. Ward a big thank you for the progress his example has made possible.
Racial equality is not perfect in the United States, but it is far worse in Korea, where mixed race children receive all sorts of abuse (some legally sanctioned, like the recently repealed ban on participation in the military), and in other places in Asia, like Japan, where Koreans are a more or less permanent underclass, prohibited from attaining citizenship in most cases, even if they were born in Japan.
Incidentally, people of Korean descent, such as adopted Korean Toby Dawson who brought home a ski mogul medal for the USA, and members of the Korean skating teams, have performed notably in the Olympics.