When the classes did amphibious exercises Boyd walked from group to group, studying their plans. Once, while the groups wrestled with how to put a landing force on the shores of Iran, Boyd realized the Marines were placing inordinate emphasis on how to establish a beachhead. “That beachhead is looming bigger and bigger,” he said. “You guys are paying too much attention to terrain. The focus should be on the enemy. Fight the enemy, not the terrain.”