It was initiated in February 1942 in the headquarters of the United States Army Forces in the Far East, but took effect when General Douglas MacArthur departed for Australia on March 17, 1942.

He had 2nd Infantry Regiment a regular Philippine Army unit under Lieutenant Colonel Calixto Duque posted in Cotabato City.

Zamboanga Sector was initially under the command of Colonel William F. Dalton and later his Lieutenant Colonel Alvin T. Wilson who was combat experience in Davao, defending entire Zamboanga peninsula including Sulu Archipelago and expanding Wolfe Field is primary mission of this sector.

With orders from General Sharp, Colonel Dalton with Major Peck and Captain Breitling transferred to Lake Pinamaloy in Bukidnon.

Communication Zone is referred as the entire Bukidnon Province which is at the center of Mindanao, it is vital as it moved units and supplies.

Colonel Frissell reorganized the sector to have reserves on both ends of the Sayre Highway, 93rd Infantry Regiment was transferred from Agusan sector to Dalirig, Another reserve force 62nd Infantry Regiment under Lieutenant Colonel Allen Thayer was moved via hard march from Lanao to Bukidnon and posted in Puntian.

Last days of the defensive campaign 61st Field Artillery was transferred to Puntian as 62nd Infantry was moved to Tankulan to defend Magima Canyon lines.

Detachment of 43rd Infantry Regiment (PS) under Major Allen Peck also in the sector as they act as instructors of the training school.

In December 1941 Sakaguchi and Muira detachments with air and naval support from 4th Fleet landed in Davao, there they faced defending troops of Colonel Hilsman.

After capturing Panay island Kawamura detachment landed in Tagoloan and Bugo in Misamis Oriental and was met by 102nd Division.

After capture of Cebu island Kawaguchi detachment landed in western coast in Cotabato town and Malabang,Lanao.