"Infantry troopers" is a term commonly used to refer to soldiers who are specifically trained for ground combat. However, there are other synonyms that can be used to describe these soldiers, including foot soldiers, ground troops, grunts, and infantrymen. Each of these terms emphasizes their role as soldiers who engage in direct combat on foot. "Foot soldiers" and "ground troops" emphasize the physical location where they operate, while "grunts" and "infantrymen" highlight their status as frontline fighters. Overall, these synonyms capture the essence of the brave men and women who put their lives on the line to protect their country and its citizens.