North Korea responded to the war games by putting its military on alert. Officials also cut off a military-communications hotline with South Korea and barred South Koreans from entering the jointly run Kaesong Industrial Complex. The gate for a cross-border road to North Korea is shown closed in Paju, South Korea. (Won Dai-Yeon / AFP / Getty Images)
A Marine takes part in the Key Resolve-Foal Eagle drills in Jinhae. The exercises will involve 26,000 U.S. servicemen, including 13,100 stationed outside South Korea, and will also involve several U.S. destroyers and the aircraft carrier John Stennis. (Kim Jae-Hwan / AFP / Getty Images)
Members of a U.S. Marine Corps anti-terrorism security team participate in the drills. (Kim Jae-Hwan / AFP / Getty Images)
South Korean conservative activists burn a placard showing a picture of North Korean leader Kim Jong-Il during a rally in Seoul. North Korean officials late last week declared that the nation, testing its most advanced long-range missile, could not guarantee the safety of South Korean passenger jets flying near its airspace. (Jung Yeon-Je / AFP / Getty Images)
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South Korean conservative activists rally against North Korea as South Korea and the U.S. begin annual joint military exercises. (Jung Yeon-Je / AFP / Getty Images)