During the Outbreak of the Second World War, the Japanese Imperial forces was did not entered and occupy the town municipalities at Santa Rosa, Nueva Ecija during the Japanese Occupation (1942-1944) through the Allied Liberation (1944-1945).

The founded of the local military establishment of the general headquarters and camp bases of the Philippine Commonwealth Army was found active on 1942 to 1946 and the 2nd Infantry Regiment of the Philippine Constabulary was found active again on 1944 to 1946 and stationed in the town municipality of Santa Rosa, Nueva Ecija.