During martial law in the territory following the attack on Pearl Harbor, all airports in the Hawaiian Islands came under the control of the U.S. military. The Army Engineers continued to expand the airport. In addition to military facilities to support an Air Corp fighter squadron at Hilo, the Army expanded and improved runways, taxiways and aprons. On April 19, 1943, the Territorial Legislature renamed Hilo Airport "General Lyman Field", for General Albert Kualii Brickwood Lyman (1885–1942), the first U.S. General of Hawaiian ancestry. He was one of three sons of Rufus Anderson Lyman to attend the United States Military Academy.