The United States reduced its participation in Cobra Gold 2015 because it disapproved of the military coup in Thailand in 2014. The U.S. sent 3,600 troops to the exercise in 2015, down from 4,300 in 2014. They also canceled the exercise in which troops practiced under live fire during an amphibious landing. However, American military forces participated in a civilian evacuation training exercise and a field training exercise in cooperation with other nations' military forces. More than 13,000 military personnel from six nations participated in Cobra Gold 2015, while other nations participated as observers.