(ROUGH CUT -- NO REPORTER NARRATION)<br /> <br />The U.S. army stationed in South Korea on Thursday conducted a combined military drill with South Korean troops, demonstrating chemical and biological deterrence.<br /> <br />About 350 U.S. soldiers took part in the drill, while South Korean military source declined to clarify how many South Korean soldiers participated.<br /> <br />The decontamination drill is aimed to provide chemical, biological, radiological and nuclear (CBRN) reconnaissance, surveillance and decontamination support to its allies, preparing for potential threats on the Korean peninsula.<br /> <br />After North Korea conducted a nuclear test in mid-February that drew swift U.N. sanctions, it ramped up tensions in its neighbourhood with near-daily threats to attack the two allies.<br /> <br />Last week, however, U.S. officials said the communist state has taken two Musudan missiles off launch-ready status and moved them from the country's east coast, after weeks of concerns that Pyongyang has been
