Soldiers of the US Army 23rd chemical battalion put on their gear as they give a demonstration of their equipment during a ceremony to give notice of the battalion's official return to the 2nd Infantry Division based in South Korea, at Camp Stanley in Uijeongbu, north of Seoul on April 4. The 23rd chemical battalion left South Korea in 2004 but the battalion with about 250 soldiers returned to the South in January 2013 to support South Korean military and the US troops based in the South, according to the infantry division. Reuters/Lee Jae-Won