EOUL, Jan. 3 (Xinhua) -- The U.S. military in South Korea said Tuesday that it will extend a curfew for service members in the country indefinitely in an attempt to ensure continued mission readiness. "We must remain focused on our primary mission here, which is to deter against external aggression and if required, defend the Republic of Korea side-by-side with our ROK counterparts," U.S. Forces Korea commander Gen. James Thurman said in a statement. "I anticipate and expect that our service members will continue to maintain the highest standards of individual readiness and professionalism while they serve in the Republic...