The 81st Infantry Division was a reserve division of the Philippine Army under the United States Army Forces in the Far East (USAFFE). It was established in the prewar period and fought 1941–1942. Its troops are from Cebu, Bohol, and Leyte but most of its troops are Americans and junior officers are Filipinos coming mostly from Luzon. The division served in defense of Mindanao but it never commanded the 4 of its maneuver regiments but was supplemented with 61st Infantry from Panay and 73rd Infantry from Negros. Also, 2nd Regular Regiment was transferred to its command in the early part of Japanese invasion of Mindanao.
The 101st Infantry Division was one the reserve divisions of the Philippine Army under the United States Army Forces in the Far East (USAFFE)'s 10th Military district mainly entire island of Mindanao.
The 102nd Infantry Division was a division of the Philippine Army under the United States Army Forces in the Far East (USAFFE).
Visayas-Mindanao Force was a military formation created in November 1941 to command all soldiers of US Army, US Philippine Scouts, Philippine Army, and Philippine Constabulary in the southern islands of the Philippines. Colonel William F. Sharp was appointed as commanding general and was promoted to Brigadier General in November 1941 and later Major General. His executive officer is Major Howard Edmands. He was just starting to organize his command and train his soldiers into a fighting unit when the war started on December 7, 1941.
Mindanao Force is a corps size military unit defending the island of Mindanao the second largest Island of the Philippines from March 17, 1942, to its surrender on May 9, 1942. The force was already created when the Visayas-Mindanao Force was split into two in March 1942. It was initiated in February 1942 in the headquarters of US Army Forces in the Far East but took effect when General Douglas MacArthur departed for Australia on March 17, 1942.
The 73rd Infantry Regiment of the Philippine Commonwealth Army was activated on August 25, 1941, was inducted to United States Army Forces in the Far East on September 1, 1941, by Captain Eugene B. Hicker of US Army. It was the last regiment among the three authorized to organized so it was not included when the entire 71st Infantry Division was ordered transferred to the main island of Luzon in September 1941.
101st Infantry Regiment is military unit and formation activated by Philippine Army during the early days of World War II. It was composed of Filipinos who resided in Mindanao, few officers from Luzon, Moros, and American soldiers assigned to command and train the regiment. It is known for his action in Davao province during the early days of war. It is credited for holding Japanese forces from reaching Kabacan for December 1941 to April 1942. It held them beyond Digos sector for 4 Months, that it needed reinforcements in April to reach Kabacan.
102nd Infantry Regiment is a military unit of the Philippine Commonwealth Army during World War II. I was activated in September 1941 and inducted to USAFFE on the same month. It fought under 101st Infantry Division
103rd Infantry Regiment is a unit activated by the Philippine Army during World War II. I was organized in Mindanao in November 1941 which was not yet ready to fight when the war broke out.
82nd Infantry Regiment is a unit activated by the Philippine Commonwealth Army for the defense of the Philippine during World War II. It defended the Cebu Island particularly in the southern part of Cebu during the Japanese landings in Cebu island on April 16, 1942. It surrendered on May 12, 1942, after it was ordered by Visayas-Mindanao Force commander General Sharp to surrender.
101st Field Artillery Regiment is a reserve field artillery regiment activated in August 1941 as part of 101st Infantry Division based in Camp Casisang in Bukidnon Province. Visayas-Mindanao Force only received 8 QF 2.95inch Mountain Guns and divided it between two divisions in the island 101st and 81st in Lanao sector. The regiment retrained into fighting as infantry due to lack of guns to operate.
United States Forces in the Philippines (USFIP) is a unified command in the Philippines during World War II. It was the successor to the United States Army Forces in the Far East (USAFFE) which General Douglas MacArthur commanded. He moved to Australia as he evacuated as ordered by President Roosevelt in March 1942. The command only lasted two months as it surrendered by Lieutenant General Jonathan M. Wainwright to Lieutenant General Homma Masaharu commander of 14th Army of the Imperial Japanese Army.
After Davao Force was dispersed on December 24, 1941, they went missing and no contact, General Joseph Vachon sent Lieutenant Colonel Howard Frissell to Digos, Davao and setup defense of Digos Junction area to prevent Japanese drive towards Digos-Pikit road and reaching Kabacan the southern terminus of Sayre Highway.
Japanese Invasion of Malabang was part of the Japanese landings on the western coast of Mindanao that began on April 29, 1942. Kawaguchi Detachment landed in three important points in west coast of Mindanao including Malabang in then undivided Lanao Province. Defending forces of Filipino and American troops resisted but due to lack of artillery pieces and Japanese Naval and Air support they were overwhelmed and forced to retreat most of the time.
Japanese invasion of Cotabato is one of the three landings made by Japanese Army during their
Japanese invasion of Zamboanga took place in March 1942 as part of Mindanao siege during Japanese campaign to invade the Philippines in December 1941 to May 1942.
61st Field Artillery Regiment was a reserve unit of Philippine Army activated in August 1941 as part of 61st Infantry Division based in Panay Island. It fought as infantry as the SS Corregidor, the ship transporting their guns, was sunk when it hit a landmine in Manila Bay.
Japanese Invasion in Cagayan de Oro, a military conflict during early days of World War II in the Philippines. It took place from May 6 to 12, 1942. Their main objective was to capture vital Del Monte Fields and link with Sakaguchi Detachment from the south via Sayre Highway.
104th Infantry Regiment, was a unit of Philippine Commonwealth Army activated and organized while the war progressed. It was organized with moros and local recruits within Cotabato-Davao Sector under 101st Infantry Division under Brigadier General Joseph Vachon in Mindanao Island during World War II.
106th Infantry Regiment, is a reserve unit of Philippine Commonwealth Army activated in January 1942 to augment the forces in Mindanao. It was attached to Zamboanga Force under Lieutenant Colonel William F. Dalton and later Lieutenant Colonel Alvin T. Wilson.
Philippines 
United States Army