The 61st Division of the Philippine Army was an infantry division from the 1941 to 1942.
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 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.
81st Infantry Regiment is a military unit and formation of the Philippine Commonwealth Army
Visayan Force is a US Forces in the Philippines subcommand which was created and took effect on March 17, 1942, after General Douglas MacArthur departed for Australia. It was disintegrated in the month after its creation due to the loss of contact of Visayan Force headquarters during the Japanese invasion of Cebu in April 16 to 19, 1942, it resorted to guerilla warfare. Eventually all forces in the Visayas was ordered to surrender on May 11, 1942.
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.
Cebu Brigade is a military unit and formation organized in January 1942 by Visayas-Mindanao Force to defend the island of Cebu after ordering 81st Infantry Division Headquarters moved to Mindanao to bolster its defenses. USAFFE and later USFIP saw the island vital for the transport of the supplies to Bataan and Corregidor. Colonel Irvine Scudder was appointed as its commander until its surrender to Japanese.
94th Provisional Infantry Regiment is a territorial defense organized by Colonel Theodore Cornell to defend the island of Leyte in 1942. On September 1, 1941, 91st Infantry Division under Colonel Luther R. Stevens, PA was ordered to moved to Luzon island to bolster the defense of the main island of the Philippines. The only remaining combat unit was 93rd Infantry Regiment under Lieutenant Colonel Ben-Hur Chastaine which was still organizing. To bolster is defense Visayas-Mindanao Force commander ordered 81st Infantry Division commander then Colonel Guy O. Fort to transfer 81st Infantry Regiment under Lieutenant Colonel Ruperto Kangleon to Samar. The 81st Infantry Regiment and 93rd Infantry comprises now the Samar Brigade under the command of Colonel Ben-Hur Chastaine.
Negros Force was activated by USAFFE on September 1, 1941, to May 12, 1942. The force did not fought during the war but played in organizing units deployed to different sector. The force also continued to fight as a guerilla after the surrender. Although the two provinces was never united due to different affiliation of the commanders.
63rd Infantry Regiment is a reserve unit of Philippine Army activated and organized during World War II. I was organized from reservist and recruits high school and college students around the 6th Military District. It is part of the 61st Infantry Division activated to cover the island of Panay. The regiment fought entirely in Panay island until it was ordered to surrendered on May 12, 1942.
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.
On April 14, 1942 Kawaguchi Detachment who just landed in Lingayen, Pangasinan intended as reinforcement of the 14th Imperial Japanese Army to finally subdue Philippine-American forces in Bataan. However, General King surrendered days earlier before they arrived. Instead, General Homma Masaharu commander of 14th Army ordered them south to secure Cebu island in the Visayas intended as launching place for invasion of Mindanao after it is secured.
Japanese invasion of Panay on April 16–18, 1942 was the second landing in the Visayas Islands after Fil-American forces surrendered in Bataan on April 9, 1942. It is the next step to prevent any supplies reach Corregidor Island and control the Visayas waters and established bases for the campaign to invade island of Mindanao to complete the invasion of the Philippines.
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.
83rd Infantry Regiment of the Philippine Army is a reserve unit activated and organized in late 1941 few months before WW II commenced in the Philippines. It fought in Cebu Island during Japanese landings in April 1942 but ordered surrendered in May 1942. It was disbanded after all soldiers were POWs but some escaped and joined the guerilla movement in Cebu.
Leyte Force is a brigade size unit that was organized in Leyte Island in the Philippines during World War II. It was commanded by Colonel Theodore Cornell of US Army until its surrender in May 1942 upon orders of General William Sharp commander of Visayas-Mindanao Force.
81st Field Artillery Regiment is a reserve unit of Philippine Commonwealth Army activated in August 1941 as part of 81st Infantry Division. It was organized and inducted in Cebu out of reserve soldiers and officers.
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.
Philippines 
United States Army