From inside a mountainside bunker, Secretary of State Condoleezza Rice saw firsthand Saturday what a war with North Korea might look like. Rice became the most senior American official to tour a command center for U.S. and South Korean troops that would be the battle headquarters in the event of fighting with the communist North. "I know that you face a close-in threat every day," Rice told troops at Command Post Tango, or Theater Air Naval Ground Operations.Rice's visit coincided with a twice-yearly war exercise involving thousands of American and South Korean soldiers. When Rice got a look at the command center, it also was the first time that reporters and cameras were allowed into the bunker south of Seoul. North Korea denounced the exercises as a rehearsal for a U.S.-led pre-emptive attack.