The Philippine Scouts (Filipino: Maghahanap ng Pilipinas/Hukbong Maghahanap ng Pilipinas) was a military organization of the United States Army from 1901 until after the end of World War II. These troops were generally Filipinos and Filipino-Americans assigned to the United States Army Philippine Department, under the command of American commissioned officers (though a handful of Filipino Americans received commissions from the United States Military Academy). Philippine Scout units were given the suffix "(PS)", to distinguish them from other U.S. Army units.
United States Army Forces in the Far East (USAFFE) was a military formation of the United States Army active from 1941 to 1946. The new command's headquarters was created on 26 July 1941, at No. 1, Calle Victoria, Manila, Luzon, the Philippines, with General Douglas MacArthur as commander. The Chief of Staff was Brigadier General Richard K. Sutherland and the Deputy Chief of Staff was Lieutenant Colonel Richard J. Marshall. The core of this command was drawn from the Office of the Military Advisor to the Commonwealth Government of the Philippines.
The Harbor Defenses of Manila and Subic Bays were a United States Army Coast Artillery Corps harbor defense command, part of the Philippine Department of the United States Army from circa 1910 through early World War II. The command primarily consisted of four forts on islands at the entrance to Manila Bay and one fort on an island in Subic Bay.
Philippine Division, or from 1944–1947 the 12th Infantry Division, was the core U.S. infantry division of the United States Army's Philippine Department during World War II.
The Philippines campaign, also known as the Battle of the Philippines or the Fall of the Philippines, was the invasion of the American territory of the Philippines by the Empire of Japan and the defense of the islands by United States and the Philippine Armies during World War II.
The Battle of Bataan was fought by the United States and the Philippine Commonwealth against Imperial Japan during World War II. The battle represented the most intense phase of the Japanese invasion of the Philippines during World War II. In January 1942, forces of the Imperial Japanese Army and Navy invaded Luzon along with several islands in the Philippine Archipelago after the bombing of the American naval base at Pearl Harbor.
The 149th Armored Regiment was an armored regiment that was part of the California Army National Guard. Its lineage dates back to a cavalry unit organized in 1895 in Salinas. As Troop C, the unit's first major action occurred when it deployed to help in the aftermath of the 1906 San Francisco Earthquake. In 1916, still as Troop C, the unit served along the Mexico–United States border near Nogales, Arizona to deter further border incursions, due to events surrounding the Pancho Villa Expedition. The following year, Troop C was activated then reorganized and redesignated as Company B, 145th Machine Gun Battalion upon the United States' entry into World War I; as part of the 40th Division, the battalion deployed to France in 1918, and returned to the United States in 1919.
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 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 91st Infantry Division was a division of the Philippine Army under the United States Army Forces in the Far East (USAFFE).
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.
South Luzon Force was a corps-sized unit of the US Army Forces Far East (USAFFE) active in the Philippines between 1941 and 1942. Created along with other 3 commands under the USAFFE, it was officially announced on November 4, 1941, and BGen. George M. Parker was appointed to command, making him responsible for the defense of Southern Luzon of any invasion. General Parker established his headquarters in Fort William McKinley in Rizal province.
93rd Infantry Regiment is a unit of 91st Infantry Division of Philippine Army activated in 1941. It was not organized until late of 1941. So it was left in Leyte island while the rest of the division was transferred to Luzon island to bolster its defense. It fought in Mindanao island where it was ordered to surrender and became POWs.
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.
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.
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.
Philippines 
United States Army 