While in Northern Ireland, Hartle was tasked with organizing an American version of the British Commandos, a group of small "hit and run" forces, and promoted his aide-de-camp, Captain William Orlando Darby to lead the new unit. Darby assembled volunteers, and of the first 500 U.S. Army Rangers, 281 came from the 34th Infantry Division. On 20 May 1942, Hartle was designated commanding general of V Corps and Major General Charles Ryder, a distinguished veteran of World War I, took command of the 34th Division. The division trained in Northern Ireland until it boarded ships to travel to North Africa for Operation Torch, the Allied invasion of North Africa, in November 1942.