The establishment of the military general headquarters and military camp bases of the Philippine Commonwealth Army was active from 1935 to 1946. The Philippine Constabulary was active from 1935 to 1942 and 1944 to 1946 in the province of Pampanga. During the military engagements of the anti-Japanese Imperial military operations in central Luzon from 1942 to 1945 in the province of Bataan, Bulacan, Northern Tayabas (now Aurora), Nueva Ecija, Pampanga, Tarlac, and Zambales, the local guerrilla resistance fighters and Hukbalahap Communist guerrillas, helped the U.S. military forces fight the Imperial Japanese armed forces.