WASHINGTON — The U.S. military on Tuesday identified four of the first American soldiers killed in the war against Iran as the Trump administration warned the intensifying conflict would lead to more American casualties. Among six U.S. military deaths so far, the four soldiers were members of an Iowa unit of the U.S. Army Reserve. They died on Sunday when a drone slammed into a U.S. military facility in Port Shuaiba, Kuwait, the U.S. military said on Tuesday. The Pentagon said four ranged in age from 20 to 42 and served in the 103rd Sustainment Command from Des Moines, Iowa, part of the army's global logistics and supply operation. The military identified the four U.S. Army Reserve soldiers, as: * Captain Cody A. Khork, 35, of Winter Haven, Florida. * Sargeant 1st Class Noah L. Tietjens, 42, of Bellevue, Nebraska * Sargeant 1st Class Nicole M. Amor, 39, of White Bear Lake, Minnesota * Sargeant Declan J. Coady, 20, of West Des Moines, Iowa Major General Todd Erskine, who leads the 79th Theater Sustainment Command, in a statement extended "my deepest sympathy and my respect" to relatives