新加坡海峡，2009年“联合海上战备和训练”演习中，新加坡空军一架 CH-47SD“支奴干”直升机降落到哈珀斯费里号船坞登陆舰上。该演习也被简称为卡拉（CARAT）多边联合演习，自1995年开始每年中旬举行一次，是美国和东南亚国家的定期演习。(A Singapore air force CH-47 Chinook helicopter lifts off June 11, 2009, while participating in shipboard landing training on the flight deck of amphibious dock landing ship USS Harpers Ferry (LSD 49) in the Straits of Singapore. The training is part of the at-sea phase of Cooperation Afloat Readiness and Training (CARAT) 2009. CARAT is an annual series of bilateral maritime training exercises between the United States and Southeast Asia nations designed to enhance the operational readiness of the participating forces.)