Republic of Singapore Navy Lt. Col. Tay Boon Chong, Head of RSN Plans and Doctrine Branch, and Lt. Col. Chew Chee Mun, Commander, Tactical Air Support Group, observe a Hellfire missile exercise from the bridge of the guided-missile destroyer USS Chung-Hoon (DDG 93) during Cooperation Afloat Readiness and Training (CARAT) 2009. CARAT is a series of bilateral exercises held annually in Southeast Asia to strengthen relationships and enhance the operational readiness of the participating forces.