The original terminal was made of composite wood material at the northern side of the runway near the Philippine Constabulary Camp, now Camp Hamac in Sicayab. During World War II, the field was overrun by rank grass. It was still used by Col. Hipolito Garma's guerrilla 105th Division, as a re-supply base for Wendell Fertig's guerrillas and as an emergency landing field. In October 1944, Governor Ranillo led the Dipolognons to clear the runway at the request of the Filipino guerrilla forces. By 8 March, four divisions of 16 Vought F4U Corsair US Marine fighter bombers and the 13th US Air Force established base as part of the Victor IV liberation plan. They covered the landing of the 41st Infantry Division in Zamboanga on D-day scheduled on 10 March. It was completely restored in 1947 with the construction of a longer runway and bigger terminal that was relocated to the eastern side of runway 20. A new access road was also constructed, complementing its facility.