In the fall of 1942, two additional Raider battalions were created; the 3rd Raiders in Samoa, commanded by Lt. Col. Harry B. Liversedge, and the 4th Raiders at Camp Pendleton, California, commanded by now-Lt. Col. James Roosevelt. These battalions distinguished themselves in heavy combat alongside the 1st and 2d Raiders in the 1943 campaigns in the upper Solomons. On 15 March 1943, the four battalions were organized as the 1st Marine Raider Regiment at Espiritu Santo, with Liversedge as commander and Carlson as executive officer. Lt. Col. Alan Shapley was named commander of the 2nd Raiders a week later and immediately returned it to a standard organization.