The National Assembly enacted Commonwealth Act No. 75 which abolished the Bureau of Non-Christian Tribes and created the Office of the Commissioner of Mindanao and Sulu.

Source: https://issuances-library.senate.gov.ph/legislative%2Bissuances/Commonwealth%20Act%2075#:~:text=AN%20ACT%20ABOLISHING%20THE%20BUREAU,COMMISSIONER%20FOR%20MINDANAO%20AND%20SULU.