Moving to San Diego in August 1942, the general took command of the Amphibious Corps, Pacific Fleet, under which he completed the amphibious indoctrination of the 2d and 3d Marine Divisions before they went overseas, and the 7th Army Division and other units involved in the Aleutians operation. The Amphibious Corps, Pacific Fleet, was later redesignated the V Amphibious Corps, and in September 1943, as commander of that unit, General Smith arrived at Pearl Harbor to begin planning for the Gilbert Islands campaign. He continued to head the V Amphibious Corps until August 1944, when he was named commanding general, Fleet Marine Force, Pacific, at Pearl Harbor. Subsequently, he commanded the Fleet Marine Force. In addition to that post, he commanded Task Force 56 in the Battle of Iwo Jima before returning to the United States in July 1945, to head the Marine Training and Replacement Command at Camp Pendleton, California. Holland was known for the quote "In our corps without responsibility and discipline we would not have won the Battle of Iwo Jima."