Luther R. Stevens (PA) was the division's commander, and Col. Edgar H. Keltner, Inf., was Chief of Staff.

Eventually 93rd was transferred to Mindanao by General Sharp commander of Visayan-Mindanao Force leaving only newly recruits and PC units defending in Leyte-Samar area.

Additional supporting units area attached when the division reached Luzon.

Ordered transfer to main land Luzon to bolster its defense Colonel Luther Steves arrived in November and assumed command.

At the outset of hostilities, 8 December 1941, the 91st Division (PA) was part of the USAFFE Reserve Force, alongside the U.S. Army's Philippine Division, the 1st Tank Group (Provisional), and three smaller Philippine Scouts units (43rd Infantry (PS), 86th FA Bn.