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The 1st Infantry Division, Philippine Army also known as Tabak Division, after years on various areas in the county, opened its present headquarters on 4 December 1989 at stationed in Camp Major Cesar L Sang-an in Barangay Pulacan, Labangan, Zamboanga Del Sur after its stint in Jolo, Sulu. It was redeployed in mainland Zamboanga Peninsula and Lanao Provinces (ZAMPELAN) to combat the Communist and Islamic rebel fighters and to counter terrorism in Mindanao, Basilan, Sulu and Tawi-Tawi (BASULTA) and started the ongoing Islamic and Communist insurgencies in Mindanao in Southern Philippines on 1969 to date against the Communist rebels of the New People's Army (NPA) and the Islamic rebels and bandits of the Moro Islamic Liberation Front (MILF), Moro National Liberation Front (MNLF) and the Abu Sayyaf Group (ASG).