The 31st Infantry Division was a division of the Philippine Army under the United States Army Forces in the Far East (USAFFE).
The 21st Infantry Division was one of the 10 reserve division of the Philippine Army mobilized under the United States Army Forces in the Far East (USAFFE). The unit was involved in the delaying action against the Japanese invasion in the plains of Central Luzon, and the Battle of Bataan in 1942.
The 11th Infantry Division was one the reserve division of the Philippine Army that was mobilized in September 1941 under the United States Army Forces in the Far East (USAFFE).
The 71st Infantry Division was a reserve division of the Philippine Army that fought under the United States Army Forces in the Far East (USAFFE). It was known for its fight with Japanese invading forces in Layac Junction, that was ordered to hold until all retreating Fil-American forces of crossed into Bataan Peninsula.
The North Luzon Force was a corps-sized grouping of the U.S.-sponsored Philippine Army, defeated in battle against the Japanese in 1941–42.
Luzon Force or Bataan Defense Force is a short-lived Field Army size unit created in the Philippines after the restructure of command organized by General Douglas MacArthur commander of US Army Forces in the Far East (USAFFE). He wished to control the 4 Commands from Australia with its representative in Corregidor Island. Major General Jonathan M. Wainwright IV was selected to command as the senior general officer in Bataan peninsula.
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.
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.
91st Infantry Regiment is a reserve unit of the Philippine Commonwealth Army during World War II. It was a part of 91st Infantry Division, based in Leyte but was transferred to Luzon to augment the defense there. It was held as a reserve force of USAFFE but participated in the Battle of Bataan.
92nd Infantry Regiment is a reserve unit of Philippine Commonwealth Army activated and organized in September 1941. It was part of 91st Division under Brigadier General Luther Stevens. They fought in Battle of Bataan and surrendered in April 1942 when Luzon Force commander Major General Edward P. King Jr., surrendered all his troops.
74th Infantry Regiment is a provisional unit activated and organized in Negros during World War II after all units of 71st Infantry Division was transferred to Luzon and Mindanao. It was comprised mostly of reserve out of ROTC cadets and recruits within Negros Island. It was activated after Headquarters, Philippine Army authorized in December 1941.
71st Field Artillery Regiment was a military unit of Philippine Army activated in 1941 as part of 71st Infantry Division. It fought in Luzon during Japanese landing and also in Bataan. All officers and men was captured during surrender of Fil-American forces in Bataan on April 9, 1942.
51st Field Artillery Regiment is a reserve unit of Philippine Commonwealth Army activated and organized in 1941 and fought during World War II. The regiment is a component of 51st Infantry Division under Brigadier General Albert M. Jones, responsible for the defense of Bicol Peninsula.
41st Field Artillery Regiment is a reserve unit of Philippine Commonwealth Army activated in August 1941 and organized to defense Southern Luzon area. It was commanded by Lieutenant Colonel Amado Martelino. It was part of General Vicente Lim's 41st Infantry Division who fought in Bataan.
91st Field Artillery Regiment is a reserve unit of Philippine Commonwealth Army activated and organized in August 1941. It is part of 91st Infantry Division under Brigadier General Luther R. Stevens, PA who fought in Battle of Bataan. Whole regiment became POW after surrendering on April 9, 1942, to Japanese 14th Army.
21st Field Artillery Regiment, a unit of the 21st Infantry Division of the Philippine Army under the USAFFE, was mobilized on 18-November-1941, and was in action from December 1941 to 09-April-1942. The Division's area of responsibility covered La Union, Nueva Ecija, Tarlac and Pangasinan.
11th Field Artillery Regiment, was a unit of 11th Infantry Division of the Philippine Army under the USAFFE, mobilized in August 1941 but was equipped in November, and was in action December 1941 to April 9, 1942. Division's area of responsibility covered Ilocos Norte, Ilocos Sur, La Union, Cordillera, Cagayan, and Isabela.
301st Field Artillery Regiment, is a heavy artillery non-divisional unit of Philippine Commonwealth Army activated in November 1941 to be used as Corps Artillery. It was activated in Camp Del Pilar, Dau, Pampanga. It fought in Battle of Bataan inflicting heavy casualties to Japanese in Abucay-Mauban Line and Orion-Bagac Line.
41st Infantry Regiment, is a unit and formation activated and organization of Philippine Commonwealth Army. It was under 41st Infantry Division under Brigadier General Vicente Lim. It fought in during World War II in the Philippines, and fought valiantly and earned Presidential Unit Citation awarded by President Manuel Quezon.
105th Infantry Regiment was a special troops of activated and organized by 101st Infantry Division during Japanese invasion of Mindanao island. Irregular soldiers from Moros and local volunteers where trained and put into one unit. During Japanese invasion of Mindanao in Cotabato-Davao Sector.
Philippines 
United States Army