 It was the first time that reconnaissance elements were added to the amphibious assault, reflecting the reconnaissance doctrine outlined in the Fleet Training Publication 167.The Army's contribution climbed to three infantry regiments with supporting arms and brigade alternated in the part of landing force and shoreline defender.Brigadier General James Roosevelt, eldest son of the late President Franklin D. Roosevelt, who as a lieutenant colonel was in the Marine Corps Reserve on active duty aboard the during one of the reconnaissance patrols and experiments with raiding and patrolling parties.