Soldiers of the U.S. Army 23rd chemical battalion wear gas masks while 

Soldiers of the U.S. Army 23rd chemical battalion wear gas masks while attending a demonstration of their equipment during a ceremony to recognize the battalion's official return to the 2nd Infantry Division based in South Korea at Camp Stanley in Uijeongbu, north of Seoul, Thursday, April 4, 2013. The 23rd chemical battalion left South Korea in 2004 and returned with some 350 soldiers in Jan. 2013. The battalion will provide nuclear, biological and chemical detection, equipment decontamination and consequence management assistance to support U.S. and South Korean military forces. North Korea warned Thursday that its military has been cleared to attack the U.S. using "smaller, lighter and diversified" nuclear weapons, while the U.S. said it will strengthen regional protection by deploying a missile defense system to Guam. (AP Photo/Lee Jin-man)
Associated Press
Soldiers of the U.S. Army 23rd chemical battalion wear gas masks while attending a demonstration of their equipment during a ceremony to recognize the battalion's official return to the 2nd Infantry Division based in South Korea at Camp Stanley in Uijeongbu, north of Seoul, Thursday, April 4, 2013. The 23rd chemical battalion left South Korea in 2004 and returned with some 350 soldiers in Jan. 2013. The battalion will provide nuclear, biological and chemical detection, equipment decontamination and consequence management assistance to support U.S. and South Korean military forces. North Korea warned Thursday that its military has been cleared to attack the U.S. using "smaller, lighter and diversified" nuclear weapons, while the U.S. said it will strengthen regional protection by deploying a missile defense system to Guam. (AP Photo/Lee Jin-man)
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