Jalandoni was born in Pontevedra, Negros Occidental to Manuel Jalandoni and Paula Ledesma. He commanded the 3rd PC Regiment in Mindanao and later served as an aide of President Manuel L. Quezon. He was in command of the PC Department of Central Luzon at the start of the Pacific War in 1941.
World War II
He served during World War II fighting Japanese forces in Southern Luzon and Bataan. He commanded the 3th Infantry (PC) Regiment of the 2nd Regular Division activated in Bataan under the command of MGen. Guillermo Francisco, the concurrent chief of the Philippine Constabulary. He was a POW when the Luzon Force surrendered on April 9, 1942. He endured the Bataan Death March and was imprisoned at Capas Internment Camp. He was released in August of that year along with all Filipino soldiers.
Post-war and later career
After the war he was appointed by President Sergio Osmeña as the new Chief of Staff of the Philippine Army and promoted to Major General on December 21, 1945 until December 20, 1948. He was succeeded by Brigadier General Mariano Castañeda as Chief of Staff upon his retirement.
In April 28, 1949, Jalandoni accompanied former first Lady Aurora Quezon, widow of former President Manuel L. Quezon on her way to the town of Baler, together with her daughter Maria Aurora (Baby) Quezon, son-in-law Felipe Buencamino III, and grandson to unveil a marker in memory of her late husband. In Bongabon, Nueva Ecija, their vehicle was ambushed by Hukbalahap rebels, leaving Jalandoni as the only survivor.[3][4]
.svg)